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Probabilities.GammaCDF Method (double, double, double)

Gamma cumulative distribution function (CDF).

Syntax
C#
Visual Basic
public static double GammaCDF(double x, double a, double b);
Parameters 
Description 
double x 
Distribution domain, real positive value. 
double a 
Defines distribution scale parameter. a must be a positive scalar. 
double b 
Defines distribution shape parameter. b must be a positive scalar. 

the Gamma cumulative distribution function (CDF) for value x using the parameters a and b. Both parameters a and b must be positive, otherwise the result is NAN.

The gamma cumulative distribution is defined by the following equation: 

 

where Gamma denotes the gamma function. The result is the probability that a single observation from a gamma distribution with parameters a and b will fall in the interval [0,x].

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