(PECL stats >= 1.0.0)

stats_cdf_noncentral_chisquareCalculates any one parameter of the non-central chi-square distribution given values for the others


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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the non-central chi-square 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 lambda denotes cumurative distribution function, the value of the random variable, the degree of freedom and the non-centrality parameter of the distribution, respectively.

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



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Return Values

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

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