Calculates any one parameter of the F distribution given values for the others. stats_cdf_exponential stats_cdf_gamma Statistic Functions PHP Manual stats_cdf_f (PECL stats:1.0.0-1.0.2)stats_cdf_f — Calculates any one parameter of the F distribution given values for the others. Description float stats_cdf_f ( float $par1 , float $par2 , float $par3 , int $which ) WarningThis function is currently not documented; only its argument list is available. Parameters par1 par2 par3 which Return Values stats_cdf_exponential stats_cdf_gamma Statistic Functions PHP Manual