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Probabilities.NegBinomCDF Method (int, double, double)
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Negative binomial cumulative distribution function (CDF).

Syntax
C#
Visual Basic
public static double NegBinomCDF(int x, double R, double p);
Parameters
Parameters 
Description 
int x 
Function domain, integer, nzmber of trials needed to obtain R successes. 
double R 
Defines number of successes, positive integer. 
double p 
Defines probability of each trial, real value on closed interval [0,1]. 
Returns

the negative binomial cumulative distribution function (CDF) for value x using the parameters R (number of success) and p (probability of success). Probability p must lie on the interval [0,1], x must be greater or equal than zero and R must be greater or equal than one, otherwise the result is NAN.

Remarks

The negative binomial cumulative distribution function is defined by the following equation: 

 

where I is the interval on which the negative binomial cumulative distribution function is not zero.

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