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<?php namespace PhpOffice\PhpSpreadsheet\Calculation\Statistical; use PhpOffice\PhpSpreadsheet\Calculation\Exception; use PhpOffice\PhpSpreadsheet\Calculation\Functions; class Confidence { /** * CONFIDENCE. * * Returns the confidence interval for a population mean * * @param mixed $alpha As a float * @param mixed $stdDev Standard Deviation as a float * @param mixed $size As an integer * * @return float|string */ public static function CONFIDENCE($alpha, $stdDev, $size) { $alpha = Functions::flattenSingleValue($alpha); $stdDev = Functions::flattenSingleValue($stdDev); $size = Functions::flattenSingleValue($size); try { $alpha = StatisticalValidations::validateFloat($alpha); $stdDev = StatisticalValidations::validateFloat($stdDev); $size = StatisticalValidations::validateInt($size); } catch (Exception $e) { return $e->getMessage(); } if (($alpha <= 0) || ($alpha >= 1) || ($stdDev <= 0) || ($size < 1)) { return Functions::NAN(); } return Distributions\StandardNormal::inverse(1 - $alpha / 2) * $stdDev / sqrt($size); } }