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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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