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(PECL stats >= 1.0.0)

stats_cdf_betaCalculates any one parameter of the beta distribution given values for the others


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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the beta 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, alpha, and beta denotes cumulative distribution function, the value of the random variable, and shape parameters of the beta distribution, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x alpha beta
2 x CDF alpha beta
3 alpha x CDF beta
4 beta x CDF alpha



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Return Values

Returns CDF, x, alpha, or beta, determined by which.

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