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PHP stats_cdf_gamma

PHP original manual for stats_cdf_gamma [ show | php.net ]

stats_cdf_gamma

(PECL stats >= 1.0.0)

stats_cdf_gamma — Calculates any one parameter of the gamma distribution given values for the others

Description

float stats_cdf_gamma ( float $par1 , float $par2 , float $par3 , int $which )

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 cumurative 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

Parameters

par1

The first parameter

par2

The second parameter

par3

The third parameter

which

The flag to determine what to be calculated

Return Values

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