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Probabilities.PoissonCDF Function
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Poisson cumulative distribution function (CDF).

Pascal
function PoissonCDF(x: integer; Lambda: double): double; overload;
File
Parameters
Parameters 
Description 
x 
Function domain, positive integer or zero. 
Lambda 
Distribution parameter, real positive value. 
Returns

the Poisson cumulative distribution function (CDF) for value x using the parameter Lambda. Lambda must be positive, otherwise the result is NAN.

Description

function PoissonPDF(x: Integer; Lambda: single): single; overload;  

The Poisson cumulative distribution function is defined by the following equation: 

 

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