This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
 Multivariate Statistics Package Symbol

# NegativeMultinomialDistribution

 NegativeMultinomialDistribution[n, p]represents a negative multinomial distribution with parameter n and failure probability vector p.
• The probability for a vector x of nonnegative integers x1, x2, ... xLength[p] in a negative multinomial distribution is proportional to (n-1+xi)!(pixi/xi!).
• The parameter n can be any positive real number, and p can be any vector of nonnegative real numbers that sum to less than unity.
• If n is a positive integer, NegativeMultinomialDistribution[n, p] gives the distribution of the failure counts in a sequence of trials with success probability 1-Total[p] and Length[p] types of failure before n successes occur.
Needs["MultivariateStatistics`"]
The mean of a negative multinomial distribution:
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The variances of each dimension:
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Probability density function:
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 Scope   (3)