/**
* VARPA
*
* Calculates variance based on the entire population, including numbers, text, and logical values
*
* Excel Function:
* VARPA(value1[,value2[, ...]])
*
* @access public
* @category Statistical Functions
* @param mixed $arg,... Data values
* @return float
*/
public static function VARPA()
{
// Return value
$returnValue = PHPExcel_Calculation_Functions::DIV0();
$summerA = $summerB = 0;
// Loop through arguments
$aArgs = PHPExcel_Calculation_Functions::flattenArrayIndexed(func_get_args());
$aCount = 0;
foreach ($aArgs as $k => $arg) {
if (is_string($arg) && PHPExcel_Calculation_Functions::isValue($k)) {
return PHPExcel_Calculation_Functions::VALUE();
} elseif (is_string($arg) && !PHPExcel_Calculation_Functions::isMatrixValue($k)) {
} else {
// Is it a numeric value?
if (is_numeric($arg) || is_bool($arg) || is_string($arg) & $arg != '') {
if (is_bool($arg)) {
$arg = (int) $arg;
} elseif (is_string($arg)) {
$arg = 0;
}
$summerA += $arg * $arg;
$summerB += $arg;
++$aCount;
}
}
}
// Return
if ($aCount > 0) {
$summerA *= $aCount;
$summerB *= $summerB;
$returnValue = ($summerA - $summerB) / ($aCount * $aCount);
}
return $returnValue;
}