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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical;
class StandardDeviations
{
/**
* STDEV.
*
* Estimates standard deviation based on a sample. The standard deviation is a measure of how
* widely values are dispersed from the average value (the mean).
*
* Excel Function:
* STDEV(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string The result, or a string containing an error
*/
public static function STDEV(...$args)
{
$result = Variances::VAR(...$args);
if (!is_numeric($result)) {
return $result;
}
return sqrt((float) $result);
}
/**
* STDEVA.
*
* Estimates standard deviation based on a sample, including numbers, text, and logical values
*
* Excel Function:
* STDEVA(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string
*/
public static function STDEVA(...$args)
{
$result = Variances::VARA(...$args);
if (!is_numeric($result)) {
return $result;
}
return sqrt((float) $result);
}
/**
* STDEVP.
*
* Calculates standard deviation based on the entire population
*
* Excel Function:
* STDEVP(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string
*/
public static function STDEVP(...$args)
{
$result = Variances::VARP(...$args);
if (!is_numeric($result)) {
return $result;
}
return sqrt((float) $result);
}
/**
* STDEVPA.
*
* Calculates standard deviation based on the entire population, including numbers, text, and logical values
*
* Excel Function:
* STDEVPA(value1[,value2[, ...]])
*
* @param mixed ...$args Data values
*
* @return float|string
*/
public static function STDEVPA(...$args)
{
$result = Variances::VARPA(...$args);
if (!is_numeric($result)) {
return $result;
}
return sqrt((float) $result);
}
}