Viewing file:  Standardize.php (1.61 KB) -rw-r--r--
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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical;
use PhpOffice\PhpSpreadsheet\Calculation\ArrayEnabled;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
class Standardize extends StatisticalValidations
{
use ArrayEnabled;
/**
* STANDARDIZE.
*
* Returns a normalized value from a distribution characterized by mean and standard_dev.
*
* @param array|float $value Value to normalize
* Or can be an array of values
* @param array|float $mean Mean Value
* Or can be an array of values
* @param array|float $stdDev Standard Deviation
* Or can be an array of values
*
* @return array|float|string Standardized value, or a string containing an error
* If an array of numbers is passed as an argument, then the returned result will also be an array
* with the same dimensions
*/
public static function execute($value, $mean, $stdDev)
{
if (is_array($value) || is_array($mean) || is_array($stdDev)) {
return self::evaluateArrayArguments([self::class, __FUNCTION__], $value, $mean, $stdDev);
}
try {
$value = self::validateFloat($value);
$mean = self::validateFloat($mean);
$stdDev = self::validateFloat($stdDev);
} catch (Exception $e) {
return $e->getMessage();
}
if ($stdDev <= 0) {
return ExcelError::NAN();
}
return ($value - $mean) / $stdDev;
}
}
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