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Negative Binomial PDF Function
Math Probability Class

Public Function NegativeBinomialPDF( _
      ByVal vNumFail As Variant _
    , ByVal vNumSuccess As Variant _
    , ByVal vProbSuccess As Variant _
    ) As Variant

Negative Binomial Probability Density Function

See also: 
    NegativeBinomialCDF Function
    Declarations Topic
    NEGBINOMDIST Function (Microsoft Excel)
vNumFail: Number of failures. Number is rounded to the nearest integer. Function returns Null if vNumFail is less than or equal to zero (<=0).
vNumSuccess: Threshold number of successes. Number is truncated to the nearest integer. Function returns Null if vNumSuccess cannot be fixed up to a Double precision floating point number.
vProbSuccess: Probability of success. Function returns Null if vProbSuccess is not between 0 and 1 inclusive.

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