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PHP stats_cdf_negative_binomial

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


(PECL stats >= 1.0.0)

stats_cdf_negative_binomialCalculates any one parameter of the negative binomial distribution given values for the others


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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the negative binomial 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, r, and p denotes cumurative distribution function, the number of failure, the number of success, and the success rate for each trial, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x r p
2 x CDF r p
3 r x CDF p
4 p x CDF r



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Return Values

Returns CDF, x, r, or p, determined by which.