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PHP stats_cdf_normal

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


(PECL stats >= 1.0.0)

stats_cdf_normalCalculates any one parameter of the normal distribution given values for the others


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

Returns the cumulative distribution function, its inverse, or one of its parameters, of the normal 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, mu, and sigma denotes cumurative distribution function, the value of the random variable, the mean and the standard deviation of the normal distribution, respectively.

Return value and parameters
which Return value par1 par2 par3
1 CDF x mu sigma
2 x CDF mu sigma
3 mu x CDF sigma
4 sigma x CDF mu



The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Return Values

Returns CDF, x, mu, or sigma, determined by which.