PHP Conference China 2020


(PECL stats >= 1.0.0)

stats_cdf_fCalculates any one parameter of the F distribution given values for the others


stats_cdf_f ( float $par1 , float $par2 , float $par3 , int $which ) : float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the F distribution. The kind of the return value and parameters (par1, par2, and par3) are determined by which.

The following table lists the return value and parameters by which. CDF, x, d1, and d2 denotes cumulative distribution function, the value of the random variable, and the degree of freedoms of the F distribution, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x d1 d2
2 x CDF d1 d2
3 d1 x CDF d2
4 d2 x CDF d1



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Dönen Değerler

Returns CDF, x, d1, or d2, determined by which.

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