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PHP stats_cdf_t

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


(PECL stats >= 1.0.0)

stats_cdf_tCalculates any one parameter of the t-distribution given values for the others


float stats_cdf_t ( float $par1 , float $par2 , int $which )

Returns the cumulative distribution function, its inverse, or one of its parameters, of the t-distribution. The kind of the return value and parameters (par1 and par2) are determined by which.

The following table lists the return value and parameters by which. CDF, x, and nu denotes cumurative distribution function, the value of the random variable, and the degrees of freedom of the t-distribution, respectively.

Return value and parameters
which Return value par1 par2
1 CDF x nu
2 x CDF nu
3 nu x CDF



The first parameter


The second parameter


The flag to determine what to be calculated

Return Values

Returns CDF, x, or nu, determined by which.