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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
class Variances extends VarianceBase
{
/**
* VAR.
*
* Estimates variance based on a sample.
*
* Excel Function:
* VAR(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string (string if result is an error)
*/
public static function VAR(...$args)
{
$returnValue = Functions::DIV0();
$summerA = $summerB = 0.0;
// Loop through arguments
$aArgs = Functions::flattenArray($args);
$aCount = 0;
foreach ($aArgs as $arg) {
$arg = self::datatypeAdjustmentBooleans($arg);
// Is it a numeric value?
if ((is_numeric($arg)) && (!is_string($arg))) {
$summerA += ($arg * $arg);
$summerB += $arg;
++$aCount;
}
}
if ($aCount > 1) {
$summerA *= $aCount;
$summerB *= $summerB;
return ($summerA - $summerB) / ($aCount * ($aCount - 1));
}
return $returnValue;
}
/**
* VARA.
*
* Estimates variance based on a sample, including numbers, text, and logical values
*
* Excel Function:
* VARA(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string (string if result is an error)
*/
public static function VARA(...$args)
{
$returnValue = Functions::DIV0();
$summerA = $summerB = 0.0;
// Loop through arguments
$aArgs = Functions::flattenArrayIndexed($args);
$aCount = 0;
foreach ($aArgs as $k => $arg) {
if ((is_string($arg)) && (Functions::isValue($k))) {
return Functions::VALUE();
} elseif ((is_string($arg)) && (!Functions::isMatrixValue($k))) {
} else {
// Is it a numeric value?
if ((is_numeric($arg)) || (is_bool($arg)) || ((is_string($arg) & ($arg != '')))) {
$arg = self::datatypeAdjustmentAllowStrings($arg);
$summerA += ($arg * $arg);
$summerB += $arg;
++$aCount;
}
}
}
if ($aCount > 1) {
$summerA *= $aCount;
$summerB *= $summerB;
return ($summerA - $summerB) / ($aCount * ($aCount - 1));
}
return $returnValue;
}
/**
* VARP.
*
* Calculates variance based on the entire population
*
* Excel Function:
* VARP(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string (string if result is an error)
*/
public static function VARP(...$args)
{
// Return value
$returnValue = Functions::DIV0();
$summerA = $summerB = 0.0;
// Loop through arguments
$aArgs = Functions::flattenArray($args);
$aCount = 0;
foreach ($aArgs as $arg) {
$arg = self::datatypeAdjustmentBooleans($arg);
// Is it a numeric value?
if ((is_numeric($arg)) && (!is_string($arg))) {
$summerA += ($arg * $arg);
$summerB += $arg;
++$aCount;
}
}
if ($aCount > 0) {
$summerA *= $aCount;
$summerB *= $summerB;
return ($summerA - $summerB) / ($aCount * $aCount);
}
return $returnValue;
}
/**
* VARPA.
*
* Calculates variance based on the entire population, including numbers, text, and logical values
*
* Excel Function:
* VARPA(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string (string if result is an error)
*/
public static function VARPA(...$args)
{
$returnValue = Functions::DIV0();
$summerA = $summerB = 0.0;
// Loop through arguments
$aArgs = Functions::flattenArrayIndexed($args);
$aCount = 0;
foreach ($aArgs as $k => $arg) {
if ((is_string($arg)) && (Functions::isValue($k))) {
return Functions::VALUE();
} elseif ((is_string($arg)) && (!Functions::isMatrixValue($k))) {
} else {
// Is it a numeric value?
if ((is_numeric($arg)) || (is_bool($arg)) || ((is_string($arg) & ($arg != '')))) {
$arg = self::datatypeAdjustmentAllowStrings($arg);
$summerA += ($arg * $arg);
$summerB += $arg;
++$aCount;
}
}
}
if ($aCount > 0) {
$summerA *= $aCount;
$summerB *= $summerB;
return ($summerA - $summerB) / ($aCount * $aCount);
}
return $returnValue;
}
}