Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Statistical.php
public static function FISHERINV($value)
    {
        $value = Functions::flattenSingleValue($value);

        if (is_numeric($value)) {
            return (exp(2 * $value) - 1) / (exp(2 * $value) + 1);
        }

        return Functions::VALUE();
    }
public static function FISHERINV($value)
    {
        $value = Functions::flattenSingleValue($value);

        if (is_numeric($value)) {
            return (exp(2 * $value) - 1) / (exp(2 * $value) + 1);
        }

        return Functions::VALUE();
    }
FISHERINV.

Returns the inverse of the Fisher transformation. Use this transformation when
analyzing correlations between ranges or arrays of data. If y = FISHER(x), then
FISHERINV(y) = x.

@param float $value

@return float