WorksheetFunction.Poisson_Dist(Double, Double, Boolean) Method
Definition
Important
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Returns the Poisson distribution. A common application of the Poisson distribution is predicting the number of events over a specific time, such as the number of cars arriving at a toll plaza in one minute.
public:
double Poisson_Dist(double Arg1, double Arg2, bool Arg3);public double Poisson_Dist (double Arg1, double Arg2, bool Arg3);Public Function Poisson_Dist (Arg1 As Double, Arg2 As Double, Arg3 As Boolean) As DoubleParameters
- Arg1
- Double
X - The number of events.
- Arg2
- Double
Mean - The expected numeric value.
- Arg3
- Boolean
Cumulative - A logical value that determines the form of the probability distribution returned. If cumulative is true, Poisson_Dist returns the cumulative Poisson probability that the number of random events occurring will be between 0 (zero) and x inclusive; if false, it returns the Poisson probability mass function that the number of events occurring will be exactly x.
Returns
Remarks
If x is not an integer, it is truncated.
If x or mean is nonnumeric, Poisson_Dist returns the #VALUE! error value.
If x < 0, Poisson_Dist returns the #NUM! error value.
If mean ≤ 0, Poisson_Dist returns the #NUM! error value.
Poisson_Dist is calculated as follows.
For cumulative = false:
Figure 1: Calcuation when cumulative is false
For cumulative = true:
Figure 2: Calcuation when cumulative is true