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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
class Standardize extends StatisticalValidations
{
/**
* STANDARDIZE.
*
* Returns a normalized value from a distribution characterized by mean and standard_dev.
*
* @param float $value Value to normalize
* @param float $mean Mean Value
* @param float $stdDev Standard Deviation
*
* @return float|string Standardized value, or a string containing an error
*/
public static function execute($value, $mean, $stdDev)
{
$value = Functions::flattenSingleValue($value);
$mean = Functions::flattenSingleValue($mean);
$stdDev = Functions::flattenSingleValue($stdDev);
try {
$value = self::validateFloat($value);
$mean = self::validateFloat($mean);
$stdDev = self::validateFloat($stdDev);
} catch (Exception $e) {
return $e->getMessage();
}
if ($stdDev <= 0) {
return Functions::NAN();
}
return ($value - $mean) / $stdDev;
}
}