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| -rw-r--r-- | admin/survey/excel/PHPExcel/Shared/JAMA/examples/Stats.php | 1605 |
1 files changed, 0 insertions, 1605 deletions
diff --git a/admin/survey/excel/PHPExcel/Shared/JAMA/examples/Stats.php b/admin/survey/excel/PHPExcel/Shared/JAMA/examples/Stats.php deleted file mode 100644 index 7d1359b..0000000 --- a/admin/survey/excel/PHPExcel/Shared/JAMA/examples/Stats.php +++ /dev/null @@ -1,1605 +0,0 @@ -<?php
-//
-// +----------------------------------------------------------------------+
-// | PHP Version 4 |
-// +----------------------------------------------------------------------+
-// | Copyright (c) 1997-2003 The PHP Group |
-// +----------------------------------------------------------------------+
-// | This source file is subject to version 2.0 of the PHP license, |
-// | that is bundled with this package in the file LICENSE, and is |
-// | available at through the world-wide-web at |
-// | http://www.php.net/license/2_02.txt. |
-// | If you did not receive a copy of the PHP license and are unable to |
-// | obtain it through the world-wide-web, please send a note to |
-// | license@php.net so we can mail you a copy immediately. |
-// +----------------------------------------------------------------------+
-// | Authors: Jesus M. Castagnetto <jmcastagnetto@php.net> |
-// +----------------------------------------------------------------------+
-//
-// $Id: Stats.php,v 1.15 2003/06/01 11:40:30 jmcastagnetto Exp $
-//
-
-include_once 'PEAR.php';
-
-/**
-* @package Math_Stats
-*/
-
-// Constants for defining the statistics to calculate /*{{{*/
-/**
-* STATS_BASIC to generate the basic descriptive statistics
-*/
-define('STATS_BASIC', 1);
-/**
-* STATS_FULL to generate also higher moments, mode, median, etc.
-*/
-define('STATS_FULL', 2);
-/*}}}*/
-
-// Constants describing the data set format /*{{{*/
-/**
-* STATS_DATA_SIMPLE for an array of numeric values. This is the default.
-* e.g. $data = array(2,3,4,5,1,1,6);
-*/
-define('STATS_DATA_SIMPLE', 0);
-/**
-* STATS_DATA_CUMMULATIVE for an associative array of frequency values,
-* where in each array entry, the index is the data point and the
-* value the count (frequency):
-* e.g. $data = array(3=>4, 2.3=>5, 1.25=>6, 0.5=>3)
-*/
-define('STATS_DATA_CUMMULATIVE', 1);
-/*}}}*/
-
-// Constants defining how to handle nulls /*{{{*/
-/**
-* STATS_REJECT_NULL, reject data sets with null values. This is the default.
-* Any non-numeric value is considered a null in this context.
-*/
-define('STATS_REJECT_NULL', -1);
-/**
-* STATS_IGNORE_NULL, ignore null values and prune them from the data.
-* Any non-numeric value is considered a null in this context.
-*/
-define('STATS_IGNORE_NULL', -2);
-/**
-* STATS_USE_NULL_AS_ZERO, assign the value of 0 (zero) to null values.
-* Any non-numeric value is considered a null in this context.
-*/
-define('STATS_USE_NULL_AS_ZERO', -3);
-/*}}}*/
-
-/**
-* A class to calculate descriptive statistics from a data set.
-* Data sets can be simple arrays of data, or a cummulative hash.
-* The second form is useful when passing large data set,
-* for example the data set:
-*
-* <pre>
-* $data1 = array (1,2,1,1,1,1,3,3,4.1,3,2,2,4.1,1,1,2,3,3,2,2,1,1,2,2);
-* </pre>
-*
-* can be epxressed more compactly as:
-*
-* <pre>
-* $data2 = array('1'=>9, '2'=>8, '3'=>5, '4.1'=>2);
-* </pre>
-*
-* Example of use:
-*
-* <pre>
-* include_once 'Math/Stats.php';
-* $s = new Math_Stats();
-* $s->setData($data1);
-* // or
-* // $s->setData($data2, STATS_DATA_CUMMULATIVE);
-* $stats = $s->calcBasic();
-* echo 'Mean: '.$stats['mean'].' StDev: '.$stats['stdev'].' <br />\n';
-*
-* // using data with nulls
-* // first ignoring them:
-* $data3 = array(1.2, 'foo', 2.4, 3.1, 4.2, 3.2, null, 5.1, 6.2);
-* $s->setNullOption(STATS_IGNORE_NULL);
-* $s->setData($data3);
-* $stats3 = $s->calcFull();
-*
-* // and then assuming nulls == 0
-* $s->setNullOption(STATS_USE_NULL_AS_ZERO);
-* $s->setData($data3);
-* $stats3 = $s->calcFull();
-* </pre>
-*
-* Originally this class was part of NumPHP (Numeric PHP package)
-*
-* @author Jesus M. Castagnetto <jmcastagnetto@php.net>
-* @version 0.8
-* @access public
-* @package Math_Stats
-*/
-class Base {/*{{{*/
- // properties /*{{{*/
-
- /**
- * The simple or cummulative data set.
- * Null by default.
- *
- * @access private
- * @var array
- */
- public $_data = null;
-
- /**
- * Expanded data set. Only set when cummulative data
- * is being used. Null by default.
- *
- * @access private
- * @var array
- */
- public $_dataExpanded = null;
-
- /**
- * Flag for data type, one of STATS_DATA_SIMPLE or
- * STATS_DATA_CUMMULATIVE. Null by default.
- *
- * @access private
- * @var int
- */
- public $_dataOption = null;
-
- /**
- * Flag for null handling options. One of STATS_REJECT_NULL,
- * STATS_IGNORE_NULL or STATS_USE_NULL_AS_ZERO
- *
- * @access private
- * @var int
- */
- public $_nullOption;
-
- /**
- * Array for caching result values, should be reset
- * when using setData()
- *
- * @access private
- * @var array
- */
- public $_calculatedValues = array();
-
- /*}}}*/
-
- /**
- * Constructor for the class
- *
- * @access public
- * @param optional int $nullOption how to handle null values
- * @return object Math_Stats
- */
- function Math_Stats($nullOption=STATS_REJECT_NULL) {/*{{{*/
- $this->_nullOption = $nullOption;
- }/*}}}*/
-
- /**
- * Sets and verifies the data, checking for nulls and using
- * the current null handling option
- *
- * @access public
- * @param array $arr the data set
- * @param optional int $opt data format: STATS_DATA_CUMMULATIVE or STATS_DATA_SIMPLE (default)
- * @return mixed true on success, a PEAR_Error object otherwise
- */
- function setData($arr, $opt=STATS_DATA_SIMPLE) {/*{{{*/
- if (!is_array($arr)) {
- return PEAR::raiseError('invalid data, an array of numeric data was expected');
- }
- $this->_data = null;
- $this->_dataExpanded = null;
- $this->_dataOption = null;
- $this->_calculatedValues = array();
- if ($opt == STATS_DATA_SIMPLE) {
- $this->_dataOption = $opt;
- $this->_data = array_values($arr);
- } else if ($opt == STATS_DATA_CUMMULATIVE) {
- $this->_dataOption = $opt;
- $this->_data = $arr;
- $this->_dataExpanded = array();
- }
- return $this->_validate();
- }/*}}}*/
-
- /**
- * Returns the data which might have been modified
- * according to the current null handling options.
- *
- * @access public
- * @param boolean $expanded whether to return a expanded list, default is false
- * @return mixed array of data on success, a PEAR_Error object otherwise
- * @see _validate()
- */
- function getData($expanded=false) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE && $expanded) {
- return $this->_dataExpanded;
- } else {
- return $this->_data;
- }
- }/*}}}*/
-
- /**
- * Sets the null handling option.
- * Must be called before assigning a new data set containing null values
- *
- * @access public
- * @return mixed true on success, a PEAR_Error object otherwise
- * @see _validate()
- */
- function setNullOption($nullOption) {/*{{{*/
- if ($nullOption == STATS_REJECT_NULL
- || $nullOption == STATS_IGNORE_NULL
- || $nullOption == STATS_USE_NULL_AS_ZERO) {
- $this->_nullOption = $nullOption;
- return true;
- } else {
- return PEAR::raiseError('invalid null handling option expecting: '.
- 'STATS_REJECT_NULL, STATS_IGNORE_NULL or STATS_USE_NULL_AS_ZERO');
- }
- }/*}}}*/
-
- /**
- * Transforms the data by substracting each entry from the mean and
- * dividing by its standard deviation. This will reset all pre-calculated
- * values to their original (unset) defaults.
- *
- * @access public
- * @return mixed true on success, a PEAR_Error object otherwise
- * @see mean()
- * @see stDev()
- * @see setData()
- */
- function studentize() {/*{{{*/
- $mean = $this->mean();
- if (PEAR::isError($mean)) {
- return $mean;
- }
- $std = $this->stDev();
- if (PEAR::isError($std)) {
- return $std;
- }
- if ($std == 0) {
- return PEAR::raiseError('cannot studentize data, standard deviation is zero.');
- }
- $arr = array();
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach ($this->_data as $val=>$freq) {
- $newval = ($val - $mean) / $std;
- $arr["$newval"] = $freq;
- }
- } else {
- foreach ($this->_data as $val) {
- $newval = ($val - $mean) / $std;
- $arr[] = $newval;
- }
- }
- return $this->setData($arr, $this->_dataOption);
- }/*}}}*/
-
- /**
- * Transforms the data by substracting each entry from the mean.
- * This will reset all pre-calculated values to their original (unset) defaults.
- *
- * @access public
- * @return mixed true on success, a PEAR_Error object otherwise
- * @see mean()
- * @see setData()
- */
- function center() {/*{{{*/
- $mean = $this->mean();
- if (PEAR::isError($mean)) {
- return $mean;
- }
- $arr = array();
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach ($this->_data as $val=>$freq) {
- $newval = $val - $mean;
- $arr["$newval"] = $freq;
- }
- } else {
- foreach ($this->_data as $val) {
- $newval = $val - $mean;
- $arr[] = $newval;
- }
- }
- return $this->setData($arr, $this->_dataOption);
- }/*}}}*/
-
- /**
- * Calculates the basic or full statistics for the data set
- *
- * @access public
- * @param int $mode one of STATS_BASIC or STATS_FULL
- * @param boolean $returnErrorObject whether the raw PEAR_Error (when true, default),
- * or only the error message will be returned (when false), if an error happens.
- * @return mixed an associative array of statistics on success, a PEAR_Error object otherwise
- * @see calcBasic()
- * @see calcFull()
- */
- function calc($mode, $returnErrorObject=true) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if ($mode == STATS_BASIC) {
- return $this->calcBasic($returnErrorObject);
- } elseif ($mode == STATS_FULL) {
- return $this->calcFull($returnErrorObject);
- } else {
- return PEAR::raiseError('incorrect mode, expected STATS_BASIC or STATS_FULL');
- }
- }/*}}}*/
-
- /**
- * Calculates a basic set of statistics
- *
- * @access public
- * @param boolean $returnErrorObject whether the raw PEAR_Error (when true, default),
- * or only the error message will be returned (when false), if an error happens.
- * @return mixed an associative array of statistics on success, a PEAR_Error object otherwise
- * @see calc()
- * @see calcFull()
- */
- function calcBasic($returnErrorObject=true) {/*{{{*/
- return array (
- 'min' => $this->__format($this->min(), $returnErrorObject),
- 'max' => $this->__format($this->max(), $returnErrorObject),
- 'sum' => $this->__format($this->sum(), $returnErrorObject),
- 'sum2' => $this->__format($this->sum2(), $returnErrorObject),
- 'count' => $this->__format($this->count(), $returnErrorObject),
- 'mean' => $this->__format($this->mean(), $returnErrorObject),
- 'stdev' => $this->__format($this->stDev(), $returnErrorObject),
- 'variance' => $this->__format($this->variance(), $returnErrorObject),
- 'range' => $this->__format($this->range(), $returnErrorObject)
- );
- }/*}}}*/
-
- /**
- * Calculates a full set of statistics
- *
- * @access public
- * @param boolean $returnErrorObject whether the raw PEAR_Error (when true, default),
- * or only the error message will be returned (when false), if an error happens.
- * @return mixed an associative array of statistics on success, a PEAR_Error object otherwise
- * @see calc()
- * @see calcBasic()
- */
- function calcFull($returnErrorObject=true) {/*{{{*/
- return array (
- 'min' => $this->__format($this->min(), $returnErrorObject),
- 'max' => $this->__format($this->max(), $returnErrorObject),
- 'sum' => $this->__format($this->sum(), $returnErrorObject),
- 'sum2' => $this->__format($this->sum2(), $returnErrorObject),
- 'count' => $this->__format($this->count(), $returnErrorObject),
- 'mean' => $this->__format($this->mean(), $returnErrorObject),
- 'median' => $this->__format($this->median(), $returnErrorObject),
- 'mode' => $this->__format($this->mode(), $returnErrorObject),
- 'midrange' => $this->__format($this->midrange(), $returnErrorObject),
- 'geometric_mean' => $this->__format($this->geometricMean(), $returnErrorObject),
- 'harmonic_mean' => $this->__format($this->harmonicMean(), $returnErrorObject),
- 'stdev' => $this->__format($this->stDev(), $returnErrorObject),
- 'absdev' => $this->__format($this->absDev(), $returnErrorObject),
- 'variance' => $this->__format($this->variance(), $returnErrorObject),
- 'range' => $this->__format($this->range(), $returnErrorObject),
- 'std_error_of_mean' => $this->__format($this->stdErrorOfMean(), $returnErrorObject),
- 'skewness' => $this->__format($this->skewness(), $returnErrorObject),
- 'kurtosis' => $this->__format($this->kurtosis(), $returnErrorObject),
- 'coeff_of_variation' => $this->__format($this->coeffOfVariation(), $returnErrorObject),
- 'sample_central_moments' => array (
- 1 => $this->__format($this->sampleCentralMoment(1), $returnErrorObject),
- 2 => $this->__format($this->sampleCentralMoment(2), $returnErrorObject),
- 3 => $this->__format($this->sampleCentralMoment(3), $returnErrorObject),
- 4 => $this->__format($this->sampleCentralMoment(4), $returnErrorObject),
- 5 => $this->__format($this->sampleCentralMoment(5), $returnErrorObject)
- ),
- 'sample_raw_moments' => array (
- 1 => $this->__format($this->sampleRawMoment(1), $returnErrorObject),
- 2 => $this->__format($this->sampleRawMoment(2), $returnErrorObject),
- 3 => $this->__format($this->sampleRawMoment(3), $returnErrorObject),
- 4 => $this->__format($this->sampleRawMoment(4), $returnErrorObject),
- 5 => $this->__format($this->sampleRawMoment(5), $returnErrorObject)
- ),
- 'frequency' => $this->__format($this->frequency(), $returnErrorObject),
- 'quartiles' => $this->__format($this->quartiles(), $returnErrorObject),
- 'interquartile_range' => $this->__format($this->interquartileRange(), $returnErrorObject),
- 'interquartile_mean' => $this->__format($this->interquartileMean(), $returnErrorObject),
- 'quartile_deviation' => $this->__format($this->quartileDeviation(), $returnErrorObject),
- 'quartile_variation_coefficient' => $this->__format($this->quartileVariationCoefficient(), $returnErrorObject),
- 'quartile_skewness_coefficient' => $this->__format($this->quartileSkewnessCoefficient(), $returnErrorObject)
- );
- }/*}}}*/
-
- /**
- * Calculates the minimum of a data set.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the minimum value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see max()
- */
- function min() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('min', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $min = min(array_keys($this->_data));
- } else {
- $min = min($this->_data);
- }
- $this->_calculatedValues['min'] = $min;
- }
- return $this->_calculatedValues['min'];
- }/*}}}*/
-
- /**
- * Calculates the maximum of a data set.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the maximum value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see min()
- */
- function max() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('max', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $max = max(array_keys($this->_data));
- } else {
- $max = max($this->_data);
- }
- $this->_calculatedValues['max'] = $max;
- }
- return $this->_calculatedValues['max'];
- }/*}}}*/
-
- /**
- * Calculates SUM { xi }
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the sum on success, a PEAR_Error object otherwise
- * @see calc()
- * @see sum2()
- * @see sumN()
- */
- function sum() {/*{{{*/
- if (!array_key_exists('sum', $this->_calculatedValues)) {
- $sum = $this->sumN(1);
- if (PEAR::isError($sum)) {
- return $sum;
- } else {
- $this->_calculatedValues['sum'] = $sum;
- }
- }
- return $this->_calculatedValues['sum'];
- }/*}}}*/
-
- /**
- * Calculates SUM { (xi)^2 }
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the sum on success, a PEAR_Error object otherwise
- * @see calc()
- * @see sum()
- * @see sumN()
- */
- function sum2() {/*{{{*/
- if (!array_key_exists('sum2', $this->_calculatedValues)) {
- $sum2 = $this->sumN(2);
- if (PEAR::isError($sum2)) {
- return $sum2;
- } else {
- $this->_calculatedValues['sum2'] = $sum2;
- }
- }
- return $this->_calculatedValues['sum2'];
- }/*}}}*/
-
- /**
- * Calculates SUM { (xi)^n }
- * Handles cummulative data sets correctly
- *
- * @access public
- * @param numeric $n the exponent
- * @return mixed the sum on success, a PEAR_Error object otherwise
- * @see calc()
- * @see sum()
- * @see sum2()
- */
- function sumN($n) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- $sumN = 0;
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach($this->_data as $val=>$freq) {
- $sumN += $freq * pow((double)$val, (double)$n);
- }
- } else {
- foreach($this->_data as $val) {
- $sumN += pow((double)$val, (double)$n);
- }
- }
- return $sumN;
- }/*}}}*/
-
- /**
- * Calculates PROD { (xi) }, (the product of all observations)
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the product on success, a PEAR_Error object otherwise
- * @see productN()
- */
- function product() {/*{{{*/
- if (!array_key_exists('product', $this->_calculatedValues)) {
- $product = $this->productN(1);
- if (PEAR::isError($product)) {
- return $product;
- } else {
- $this->_calculatedValues['product'] = $product;
- }
- }
- return $this->_calculatedValues['product'];
- }/*}}}*/
-
- /**
- * Calculates PROD { (xi)^n }, which is the product of all observations
- * Handles cummulative data sets correctly
- *
- * @access public
- * @param numeric $n the exponent
- * @return mixed the product on success, a PEAR_Error object otherwise
- * @see product()
- */
- function productN($n) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- $prodN = 1.0;
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach($this->_data as $val=>$freq) {
- if ($val == 0) {
- return 0.0;
- }
- $prodN *= $freq * pow((double)$val, (double)$n);
- }
- } else {
- foreach($this->_data as $val) {
- if ($val == 0) {
- return 0.0;
- }
- $prodN *= pow((double)$val, (double)$n);
- }
- }
- return $prodN;
-
- }/*}}}*/
-
- /**
- * Calculates the number of data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the count on success, a PEAR_Error object otherwise
- * @see calc()
- */
- function count() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('count', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $count = count($this->_dataExpanded);
- } else {
- $count = count($this->_data);
- }
- $this->_calculatedValues['count'] = $count;
- }
- return $this->_calculatedValues['count'];
- }/*}}}*/
-
- /**
- * Calculates the mean (average) of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the mean value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see sum()
- * @see count()
- */
- function mean() {/*{{{*/
- if (!array_key_exists('mean', $this->_calculatedValues)) {
- $sum = $this->sum();
- if (PEAR::isError($sum)) {
- return $sum;
- }
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $this->_calculatedValues['mean'] = $sum / $count;
- }
- return $this->_calculatedValues['mean'];
- }/*}}}*/
-
- /**
- * Calculates the range of the data set = max - min
- *
- * @access public
- * @return mixed the value of the range on success, a PEAR_Error object otherwise.
- */
- function range() {/*{{{*/
- if (!array_key_exists('range', $this->_calculatedValues)) {
- $min = $this->min();
- if (PEAR::isError($min)) {
- return $min;
- }
- $max = $this->max();
- if (PEAR::isError($max)) {
- return $max;
- }
- $this->_calculatedValues['range'] = $max - $min;
- }
- return $this->_calculatedValues['range'];
-
- }/*}}}*/
-
- /**
- * Calculates the variance (unbiased) of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the variance value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see __sumdiff()
- * @see count()
- */
- function variance() {/*{{{*/
- if (!array_key_exists('variance', $this->_calculatedValues)) {
- $variance = $this->__calcVariance();
- if (PEAR::isError($variance)) {
- return $variance;
- }
- $this->_calculatedValues['variance'] = $variance;
- }
- return $this->_calculatedValues['variance'];
- }/*}}}*/
-
- /**
- * Calculates the standard deviation (unbiased) of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the standard deviation on success, a PEAR_Error object otherwise
- * @see calc()
- * @see variance()
- */
- function stDev() {/*{{{*/
- if (!array_key_exists('stDev', $this->_calculatedValues)) {
- $variance = $this->variance();
- if (PEAR::isError($variance)) {
- return $variance;
- }
- $this->_calculatedValues['stDev'] = sqrt($variance);
- }
- return $this->_calculatedValues['stDev'];
- }/*}}}*/
-
- /**
- * Calculates the variance (unbiased) of the data points in the set
- * given a fixed mean (average) value. Not used in calcBasic(), calcFull()
- * or calc().
- * Handles cummulative data sets correctly
- *
- * @access public
- * @param numeric $mean the fixed mean value
- * @return mixed the variance on success, a PEAR_Error object otherwise
- * @see __sumdiff()
- * @see count()
- * @see variance()
- */
- function varianceWithMean($mean) {/*{{{*/
- return $this->__calcVariance($mean);
- }/*}}}*/
-
- /**
- * Calculates the standard deviation (unbiased) of the data points in the set
- * given a fixed mean (average) value. Not used in calcBasic(), calcFull()
- * or calc().
- * Handles cummulative data sets correctly
- *
- * @access public
- * @param numeric $mean the fixed mean value
- * @return mixed the standard deviation on success, a PEAR_Error object otherwise
- * @see varianceWithMean()
- * @see stDev()
- */
- function stDevWithMean($mean) {/*{{{*/
- $varianceWM = $this->varianceWithMean($mean);
- if (PEAR::isError($varianceWM)) {
- return $varianceWM;
- }
- return sqrt($varianceWM);
- }/*}}}*/
-
- /**
- * Calculates the absolute deviation of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the absolute deviation on success, a PEAR_Error object otherwise
- * @see calc()
- * @see __sumabsdev()
- * @see count()
- * @see absDevWithMean()
- */
- function absDev() {/*{{{*/
- if (!array_key_exists('absDev', $this->_calculatedValues)) {
- $absDev = $this->__calcAbsoluteDeviation();
- if (PEAR::isError($absdev)) {
- return $absdev;
- }
- $this->_calculatedValues['absDev'] = $absDev;
- }
- return $this->_calculatedValues['absDev'];
- }/*}}}*/
-
- /**
- * Calculates the absolute deviation of the data points in the set
- * given a fixed mean (average) value. Not used in calcBasic(), calcFull()
- * or calc().
- * Handles cummulative data sets correctly
- *
- * @access public
- * @param numeric $mean the fixed mean value
- * @return mixed the absolute deviation on success, a PEAR_Error object otherwise
- * @see __sumabsdev()
- * @see absDev()
- */
- function absDevWithMean($mean) {/*{{{*/
- return $this->__calcAbsoluteDeviation($mean);
- }/*}}}*/
-
- /**
- * Calculates the skewness of the data distribution in the set
- * The skewness measures the degree of asymmetry of a distribution,
- * and is related to the third central moment of a distribution.
- * A normal distribution has a skewness = 0
- * A distribution with a tail off towards the high end of the scale
- * (positive skew) has a skewness > 0
- * A distribution with a tail off towards the low end of the scale
- * (negative skew) has a skewness < 0
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the skewness value on success, a PEAR_Error object otherwise
- * @see __sumdiff()
- * @see count()
- * @see stDev()
- * @see calc()
- */
- function skewness() {/*{{{*/
- if (!array_key_exists('skewness', $this->_calculatedValues)) {
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $stDev = $this->stDev();
- if (PEAR::isError($stDev)) {
- return $stDev;
- }
- $sumdiff3 = $this->__sumdiff(3);
- if (PEAR::isError($sumdiff3)) {
- return $sumdiff3;
- }
- $this->_calculatedValues['skewness'] = ($sumdiff3 / ($count * pow($stDev, 3)));
- }
- return $this->_calculatedValues['skewness'];
- }/*}}}*/
-
- /**
- * Calculates the kurtosis of the data distribution in the set
- * The kurtosis measures the degrees of peakedness of a distribution.
- * It is also called the "excess" or "excess coefficient", and is
- * a normalized form of the fourth central moment of a distribution.
- * A normal distributions has kurtosis = 0
- * A narrow and peaked (leptokurtic) distribution has a
- * kurtosis > 0
- * A flat and wide (platykurtic) distribution has a kurtosis < 0
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the kurtosis value on success, a PEAR_Error object otherwise
- * @see __sumdiff()
- * @see count()
- * @see stDev()
- * @see calc()
- */
- function kurtosis() {/*{{{*/
- if (!array_key_exists('kurtosis', $this->_calculatedValues)) {
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $stDev = $this->stDev();
- if (PEAR::isError($stDev)) {
- return $stDev;
- }
- $sumdiff4 = $this->__sumdiff(4);
- if (PEAR::isError($sumdiff4)) {
- return $sumdiff4;
- }
- $this->_calculatedValues['kurtosis'] = ($sumdiff4 / ($count * pow($stDev, 4))) - 3;
- }
- return $this->_calculatedValues['kurtosis'];
- }/*}}}*/
-
- /**
- * Calculates the median of a data set.
- * The median is the value such that half of the points are below it
- * in a sorted data set.
- * If the number of values is odd, it is the middle item.
- * If the number of values is even, is the average of the two middle items.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the median value on success, a PEAR_Error object otherwise
- * @see count()
- * @see calc()
- */
- function median() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('median', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $arr =& $this->_dataExpanded;
- } else {
- $arr =& $this->_data;
- }
- $n = $this->count();
- if (PEAR::isError($n)) {
- return $n;
- }
- $h = intval($n / 2);
- if ($n % 2 == 0) {
- $median = ($arr[$h] + $arr[$h - 1]) / 2;
- } else {
- $median = $arr[$h + 1];
- }
- $this->_calculatedValues['median'] = $median;
- }
- return $this->_calculatedValues['median'];
- }/*}}}*/
-
- /**
- * Calculates the mode of a data set.
- * The mode is the value with the highest frequency in the data set.
- * There can be more than one mode.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed an array of mode value on success, a PEAR_Error object otherwise
- * @see frequency()
- * @see calc()
- */
- function mode() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('mode', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $arr = $this->_data;
- } else {
- $arr = $this->frequency();
- }
- arsort($arr);
- $mcount = 1;
- foreach ($arr as $val=>$freq) {
- if ($mcount == 1) {
- $mode = array($val);
- $mfreq = $freq;
- ++$mcount;
- continue;
- }
- if ($mfreq == $freq)
- $mode[] = $val;
- if ($mfreq > $freq)
- break;
- }
- $this->_calculatedValues['mode'] = $mode;
- }
- return $this->_calculatedValues['mode'];
- }/*}}}*/
-
- /**
- * Calculates the midrange of a data set.
- * The midrange is the average of the minimum and maximum of the data set.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the midrange value on success, a PEAR_Error object otherwise
- * @see min()
- * @see max()
- * @see calc()
- */
- function midrange() {/*{{{*/
- if (!array_key_exists('midrange', $this->_calculatedValues)) {
- $min = $this->min();
- if (PEAR::isError($min)) {
- return $min;
- }
- $max = $this->max();
- if (PEAR::isError($max)) {
- return $max;
- }
- $this->_calculatedValues['midrange'] = (($max + $min) / 2);
- }
- return $this->_calculatedValues['midrange'];
- }/*}}}*/
-
- /**
- * Calculates the geometrical mean of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the geometrical mean value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see product()
- * @see count()
- */
- function geometricMean() {/*{{{*/
- if (!array_key_exists('geometricMean', $this->_calculatedValues)) {
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $prod = $this->product();
- if (PEAR::isError($prod)) {
- return $prod;
- }
- if ($prod == 0.0) {
- return 0.0;
- }
- if ($prod < 0) {
- return PEAR::raiseError('The product of the data set is negative, geometric mean undefined.');
- }
- $this->_calculatedValues['geometricMean'] = pow($prod , 1 / $count);
- }
- return $this->_calculatedValues['geometricMean'];
- }/*}}}*/
-
- /**
- * Calculates the harmonic mean of the data points in the set
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the harmonic mean value on success, a PEAR_Error object otherwise
- * @see calc()
- * @see count()
- */
- function harmonicMean() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('harmonicMean', $this->_calculatedValues)) {
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $invsum = 0.0;
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach($this->_data as $val=>$freq) {
- if ($val == 0) {
- return PEAR::raiseError('cannot calculate a '.
- 'harmonic mean with data values of zero.');
- }
- $invsum += $freq / $val;
- }
- } else {
- foreach($this->_data as $val) {
- if ($val == 0) {
- return PEAR::raiseError('cannot calculate a '.
- 'harmonic mean with data values of zero.');
- }
- $invsum += 1 / $val;
- }
- }
- $this->_calculatedValues['harmonicMean'] = $count / $invsum;
- }
- return $this->_calculatedValues['harmonicMean'];
- }/*}}}*/
-
- /**
- * Calculates the nth central moment (m{n}) of a data set.
- *
- * The definition of a sample central moment is:
- *
- * m{n} = 1/N * SUM { (xi - avg)^n }
- *
- * where: N = sample size, avg = sample mean.
- *
- * @access public
- * @param integer $n moment to calculate
- * @return mixed the numeric value of the moment on success, PEAR_Error otherwise
- */
- function sampleCentralMoment($n) {/*{{{*/
- if (!is_int($n) || $n < 1) {
- return PEAR::isError('moment must be a positive integer >= 1.');
- }
-
- if ($n == 1) {
- return 0;
- }
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- if ($count == 0) {
- return PEAR::raiseError("Cannot calculate {$n}th sample moment, ".
- 'there are zero data entries');
- }
- $sum = $this->__sumdiff($n);
- if (PEAR::isError($sum)) {
- return $sum;
- }
- return ($sum / $count);
- }/*}}}*/
-
- /**
- * Calculates the nth raw moment (m{n}) of a data set.
- *
- * The definition of a sample central moment is:
- *
- * m{n} = 1/N * SUM { xi^n }
- *
- * where: N = sample size, avg = sample mean.
- *
- * @access public
- * @param integer $n moment to calculate
- * @return mixed the numeric value of the moment on success, PEAR_Error otherwise
- */
- function sampleRawMoment($n) {/*{{{*/
- if (!is_int($n) || $n < 1) {
- return PEAR::isError('moment must be a positive integer >= 1.');
- }
-
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- if ($count == 0) {
- return PEAR::raiseError("Cannot calculate {$n}th raw moment, ".
- 'there are zero data entries.');
- }
- $sum = $this->sumN($n);
- if (PEAR::isError($sum)) {
- return $sum;
- }
- return ($sum / $count);
- }/*}}}*/
-
-
- /**
- * Calculates the coefficient of variation of a data set.
- * The coefficient of variation measures the spread of a set of data
- * as a proportion of its mean. It is often expressed as a percentage.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed the coefficient of variation on success, a PEAR_Error object otherwise
- * @see stDev()
- * @see mean()
- * @see calc()
- */
- function coeffOfVariation() {/*{{{*/
- if (!array_key_exists('coeffOfVariation', $this->_calculatedValues)) {
- $mean = $this->mean();
- if (PEAR::isError($mean)) {
- return $mean;
- }
- if ($mean == 0.0) {
- return PEAR::raiseError('cannot calculate the coefficient '.
- 'of variation, mean of sample is zero');
- }
- $stDev = $this->stDev();
- if (PEAR::isError($stDev)) {
- return $stDev;
- }
-
- $this->_calculatedValues['coeffOfVariation'] = $stDev / $mean;
- }
- return $this->_calculatedValues['coeffOfVariation'];
- }/*}}}*/
-
- /**
- * Calculates the standard error of the mean.
- * It is the standard deviation of the sampling distribution of
- * the mean. The formula is:
- *
- * S.E. Mean = SD / (N)^(1/2)
- *
- * This formula does not assume a normal distribution, and shows
- * that the size of the standard error of the mean is inversely
- * proportional to the square root of the sample size.
- *
- * @access public
- * @return mixed the standard error of the mean on success, a PEAR_Error object otherwise
- * @see stDev()
- * @see count()
- * @see calc()
- */
- function stdErrorOfMean() {/*{{{*/
- if (!array_key_exists('stdErrorOfMean', $this->_calculatedValues)) {
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $stDev = $this->stDev();
- if (PEAR::isError($stDev)) {
- return $stDev;
- }
- $this->_calculatedValues['stdErrorOfMean'] = $stDev / sqrt($count);
- }
- return $this->_calculatedValues['stdErrorOfMean'];
- }/*}}}*/
-
- /**
- * Calculates the value frequency table of a data set.
- * Handles cummulative data sets correctly
- *
- * @access public
- * @return mixed an associative array of value=>frequency items on success, a PEAR_Error object otherwise
- * @see min()
- * @see max()
- * @see calc()
- */
- function frequency() {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (!array_key_exists('frequency', $this->_calculatedValues)) {
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $freq = $this->_data;
- } else {
- $freq = array();
- foreach ($this->_data as $val) {
- $freq["$val"]++;
- }
- ksort($freq);
- }
- $this->_calculatedValues['frequency'] = $freq;
- }
- return $this->_calculatedValues['frequency'];
- }/*}}}*/
-
- /**
- * The quartiles are defined as the values that divide a sorted
- * data set into four equal-sized subsets, and correspond to the
- * 25th, 50th, and 75th percentiles.
- *
- * @access public
- * @return mixed an associative array of quartiles on success, a PEAR_Error otherwise
- * @see percentile()
- */
- function quartiles() {/*{{{*/
- if (!array_key_exists('quartiles', $this->_calculatedValues)) {
- $q1 = $this->percentile(25);
- if (PEAR::isError($q1)) {
- return $q1;
- }
- $q2 = $this->percentile(50);
- if (PEAR::isError($q2)) {
- return $q2;
- }
- $q3 = $this->percentile(75);
- if (PEAR::isError($q3)) {
- return $q3;
- }
- $this->_calculatedValues['quartiles'] = array (
- '25' => $q1,
- '50' => $q2,
- '75' => $q3
- );
- }
- return $this->_calculatedValues['quartiles'];
- }/*}}}*/
-
- /**
- * The interquartile mean is defined as the mean of the values left
- * after discarding the lower 25% and top 25% ranked values, i.e.:
- *
- * interquart mean = mean(<P(25),P(75)>)
- *
- * where: P = percentile
- *
- * @todo need to double check the equation
- * @access public
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- */
- function interquartileMean() {/*{{{*/
- if (!array_key_exists('interquartileMean', $this->_calculatedValues)) {
- $quart = $this->quartiles();
- if (PEAR::isError($quart)) {
- return $quart;
- }
- $q3 = $quart['75'];
- $q1 = $quart['25'];
- $sum = 0;
- $n = 0;
- foreach ($this->getData(true) as $val) {
- if ($val >= $q1 && $val <= $q3) {
- $sum += $val;
- ++$n;
- }
- }
- if ($n == 0) {
- return PEAR::raiseError('error calculating interquartile mean, '.
- 'empty interquartile range of values.');
- }
- $this->_calculatedValues['interquartileMean'] = $sum / $n;
- }
- return $this->_calculatedValues['interquartileMean'];
- }/*}}}*/
-
- /**
- * The interquartile range is the distance between the 75th and 25th
- * percentiles. Basically the range of the middle 50% of the data set,
- * and thus is not affected by outliers or extreme values.
- *
- * interquart range = P(75) - P(25)
- *
- * where: P = percentile
- *
- * @access public
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- */
- function interquartileRange() {/*{{{*/
- if (!array_key_exists('interquartileRange', $this->_calculatedValues)) {
- $quart = $this->quartiles();
- if (PEAR::isError($quart)) {
- return $quart;
- }
- $q3 = $quart['75'];
- $q1 = $quart['25'];
- $this->_calculatedValues['interquartileRange'] = $q3 - $q1;
- }
- return $this->_calculatedValues['interquartileRange'];
- }/*}}}*/
-
- /**
- * The quartile deviation is half of the interquartile range value
- *
- * quart dev = (P(75) - P(25)) / 2
- *
- * where: P = percentile
- *
- * @access public
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- * @see interquartileRange()
- */
- function quartileDeviation() {/*{{{*/
- if (!array_key_exists('quartileDeviation', $this->_calculatedValues)) {
- $iqr = $this->interquartileRange();
- if (PEAR::isError($iqr)) {
- return $iqr;
- }
- $this->_calculatedValues['quartileDeviation'] = $iqr / 2;
- }
- return $this->_calculatedValues['quartileDeviation'];
- }/*}}}*/
-
- /**
- * The quartile variation coefficient is defines as follows:
- *
- * quart var coeff = 100 * (P(75) - P(25)) / (P(75) + P(25))
- *
- * where: P = percentile
- *
- * @todo need to double check the equation
- * @access public
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- */
- function quartileVariationCoefficient() {/*{{{*/
- if (!array_key_exists('quartileVariationCoefficient', $this->_calculatedValues)) {
- $quart = $this->quartiles();
- if (PEAR::isError($quart)) {
- return $quart;
- }
- $q3 = $quart['75'];
- $q1 = $quart['25'];
- $d = $q3 - $q1;
- $s = $q3 + $q1;
- $this->_calculatedValues['quartileVariationCoefficient'] = 100 * $d / $s;
- }
- return $this->_calculatedValues['quartileVariationCoefficient'];
- }/*}}}*/
-
- /**
- * The quartile skewness coefficient (also known as Bowley Skewness),
- * is defined as follows:
- *
- * quart skewness coeff = (P(25) - 2*P(50) + P(75)) / (P(75) - P(25))
- *
- * where: P = percentile
- *
- * @todo need to double check the equation
- * @access public
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- */
- function quartileSkewnessCoefficient() {/*{{{*/
- if (!array_key_exists('quartileSkewnessCoefficient', $this->_calculatedValues)) {
- $quart = $this->quartiles();
- if (PEAR::isError($quart)) {
- return $quart;
- }
- $q3 = $quart['75'];
- $q2 = $quart['50'];
- $q1 = $quart['25'];
- $d = $q3 - 2*$q2 + $q1;
- $s = $q3 - $q1;
- $this->_calculatedValues['quartileSkewnessCoefficient'] = $d / $s;
- }
- return $this->_calculatedValues['quartileSkewnessCoefficient'];
- }/*}}}*/
-
- /**
- * The pth percentile is the value such that p% of the a sorted data set
- * is smaller than it, and (100 - p)% of the data is larger.
- *
- * A quick algorithm to pick the appropriate value from a sorted data
- * set is as follows:
- *
- * - Count the number of values: n
- * - Calculate the position of the value in the data list: i = p * (n + 1)
- * - if i is an integer, return the data at that position
- * - if i < 1, return the minimum of the data set
- * - if i > n, return the maximum of the data set
- * - otherwise, average the entries at adjacent positions to i
- *
- * The median is the 50th percentile value.
- *
- * @todo need to double check generality of the algorithm
- *
- * @access public
- * @param numeric $p the percentile to estimate, e.g. 25 for 25th percentile
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see quartiles()
- * @see median()
- */
- function percentile($p) {/*{{{*/
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- $data =& $this->_dataExpanded;
- } else {
- $data =& $this->_data;
- }
- $obsidx = $p * ($count + 1) / 100;
- if (intval($obsidx) == $obsidx) {
- return $data[($obsidx - 1)];
- } elseif ($obsidx < 1) {
- return $data[0];
- } elseif ($obsidx > $count) {
- return $data[($count - 1)];
- } else {
- $left = floor($obsidx - 1);
- $right = ceil($obsidx - 1);
- return ($data[$left] + $data[$right]) / 2;
- }
- }/*}}}*/
-
- // private methods
-
- /**
- * Utility function to calculate: SUM { (xi - mean)^n }
- *
- * @access private
- * @param numeric $power the exponent
- * @param optional double $mean the data set mean value
- * @return mixed the sum on success, a PEAR_Error object otherwise
- *
- * @see stDev()
- * @see variaceWithMean();
- * @see skewness();
- * @see kurtosis();
- */
- function __sumdiff($power, $mean=null) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (is_null($mean)) {
- $mean = $this->mean();
- if (PEAR::isError($mean)) {
- return $mean;
- }
- }
- $sdiff = 0;
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach ($this->_data as $val=>$freq) {
- $sdiff += $freq * pow((double)($val - $mean), (double)$power);
- }
- } else {
- foreach ($this->_data as $val)
- $sdiff += pow((double)($val - $mean), (double)$power);
- }
- return $sdiff;
- }/*}}}*/
-
- /**
- * Utility function to calculate the variance with or without
- * a fixed mean
- *
- * @access private
- * @param $mean the fixed mean to use, null as default
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see variance()
- * @see varianceWithMean()
- */
- function __calcVariance($mean = null) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- $sumdiff2 = $this->__sumdiff(2, $mean);
- if (PEAR::isError($sumdiff2)) {
- return $sumdiff2;
- }
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- if ($count == 1) {
- return PEAR::raiseError('cannot calculate variance of a singe data point');
- }
- return ($sumdiff2 / ($count - 1));
- }/*}}}*/
-
- /**
- * Utility function to calculate the absolute deviation with or without
- * a fixed mean
- *
- * @access private
- * @param $mean the fixed mean to use, null as default
- * @return mixed a numeric value on success, a PEAR_Error otherwise
- * @see absDev()
- * @see absDevWithMean()
- */
- function __calcAbsoluteDeviation($mean = null) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- $count = $this->count();
- if (PEAR::isError($count)) {
- return $count;
- }
- $sumabsdev = $this->__sumabsdev($mean);
- if (PEAR::isError($sumabsdev)) {
- return $sumabsdev;
- }
- return $sumabsdev / $count;
- }/*}}}*/
-
- /**
- * Utility function to calculate: SUM { | xi - mean | }
- *
- * @access private
- * @param optional double $mean the mean value for the set or population
- * @return mixed the sum on success, a PEAR_Error object otherwise
- *
- * @see absDev()
- * @see absDevWithMean()
- */
- function __sumabsdev($mean=null) {/*{{{*/
- if ($this->_data == null) {
- return PEAR::raiseError('data has not been set');
- }
- if (is_null($mean)) {
- $mean = $this->mean();
- }
- $sdev = 0;
- if ($this->_dataOption == STATS_DATA_CUMMULATIVE) {
- foreach ($this->_data as $val=>$freq) {
- $sdev += $freq * abs($val - $mean);
- }
- } else {
- foreach ($this->_data as $val) {
- $sdev += abs($val - $mean);
- }
- }
- return $sdev;
- }/*}}}*/
-
- /**
- * Utility function to format a PEAR_Error to be used by calc(),
- * calcBasic() and calcFull()
- *
- * @access private
- * @param mixed $v value to be formatted
- * @param boolean $returnErrorObject whether the raw PEAR_Error (when true, default),
- * or only the error message will be returned (when false)
- * @return mixed if the value is a PEAR_Error object, and $useErrorObject
- * is false, then a string with the error message will be returned,
- * otherwise the value will not be modified and returned as passed.
- */
- function __format($v, $useErrorObject=true) {/*{{{*/
- if (PEAR::isError($v) && $useErrorObject == false) {
- return $v->getMessage();
- } else {
- return $v;
- }
- }/*}}}*/
-
- /**
- * Utility function to validate the data and modify it
- * according to the current null handling option
- *
- * @access private
- * @return mixed true on success, a PEAR_Error object otherwise
- *
- * @see setData()
- */
- function _validate() {/*{{{*/
- $flag = ($this->_dataOption == STATS_DATA_CUMMULATIVE);
- foreach ($this->_data as $key=>$value) {
- $d = ($flag) ? $key : $value;
- $v = ($flag) ? $value : $key;
- if (!is_numeric($d)) {
- switch ($this->_nullOption) {
- case STATS_IGNORE_NULL :
- unset($this->_data["$key"]);
- break;
- case STATS_USE_NULL_AS_ZERO:
- if ($flag) {
- unset($this->_data["$key"]);
- $this->_data[0] += $v;
- } else {
- $this->_data[$key] = 0;
- }
- break;
- case STATS_REJECT_NULL :
- default:
- return PEAR::raiseError('data rejected, contains NULL values');
- break;
- }
- }
- }
- if ($flag) {
- ksort($this->_data);
- $this->_dataExpanded = array();
- foreach ($this->_data as $val=>$freq) {
- $this->_dataExpanded = array_pad($this->_dataExpanded, count($this->_dataExpanded) + $freq, $val);
- }
- sort($this->_dataExpanded);
- } else {
- sort($this->_data);
- }
- return true;
- }/*}}}*/
-
-}/*}}}*/
-
-// vim: ts=4:sw=4:et:
-// vim6: fdl=1: fdm=marker:
-
-?>
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