(PECL stats >= 1.0.0)

stats_cdf_weibullCalculates any one parameter of the Weibull distribution given values for the others


stats_cdf_weibull ( float $par1 , float $par2 , float $par3 , int $which ) : float

Returns the cumulative distribution function, its inverse, or one of its parameters, of the Weibull 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 cumulative distribution function, the value of the random variable, the shape and the scale parameter of the Weibull 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

Список параметров


The first parameter


The second parameter


The third parameter


The flag to determine what to be calculated

Возвращаемые значения

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