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(PECL stats >= 1.0.0)

stats_cdf_gammaCalculates any one parameter of the gamma distribution given values for the others


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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the gamma 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, k, and theta denotes cumulative distribution function, the value of the random variable, and the shape and the scale parameter of the gamma distribution, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x k theta
2 x CDF k theta
3 k x CDF theta
4 theta x CDF k



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Valor Retornado

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

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