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This function returns a random integer from the negative binomial distribution, the number of failures occurring before n successes in independent trials with probability p of success. The probability distribution for negative binomial variates is, Note that n is not required to be an integer.
This function computes the probability p(k) of obtaining k from a negative binomial distribution with parameters p and n, using the formula given above.
These functions compute the cumulative distribution functions P(k), Q(k) for the negative binomial distribution with parameters p and n.