Evaluates the Poisson probability density function.
Namespace:
Imsl.StatAssembly: ImslCS (in ImslCS.dll) Version: 6.5.0.0
Syntax
C# |
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public static double Poisson( int k, double theta ) |
Visual Basic (Declaration) |
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Public Shared Function Poisson ( _ k As Integer, _ theta As Double _ ) As Double |
Visual C++ |
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public: static double Poisson( int k, double theta ) |
Parameters
- k
- Type: System..::.Int32
An int scalar for which the Poisson probability function is to be evaluated.
- theta
- Type: System..::.Double
A double scalar value representing the mean of the Poisson distribution.
Return Value
A double scalar value representing the probability that a Poisson random variable takes a value equal to k.Remarks
Method Pdf.Poisson evaluates the probability density function of a Poisson random variable with parameter theta. theta, which is the mean of the Poisson random variable, must be positive. The probability function (with ) is
Pdf.Poisson evaluates this function directly, taking logarithms and using the log gamma function.