CascadiaPHP 2024


(PECL stats >= 1.0.0)

stats_cdf_chisquareCalculates any one parameter of the chi-square distribution given values for the others


stats_cdf_chisquare(float $par1, float $par2, int $which): float

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

The following table lists the return value and parameters by which. CDF, x, and k denotes cumulative distribution function, the value of the random variable, and the degree of freedom of the chi-square distribution, respectively.

Return value and parameters
which Return value par1 par2
1 CDF x k
2 x CDF k
3 k x CDF



The first parameter


The second parameter


The flag to determine what to be calculated

Valor Retornado

Returns CDF, x, or k, determined by which.

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