gammaDistribution(alpha, lambda)
The gamma distribution. When alpha is an integer (also known as the Erlang distribution), this is waiting time until the alphath event in a Poisson process where lambda is the expected number of events in one unit of time. In particular, when alpha is 1, this is the exponential distribution.
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Some probability texts define the gamma distribution using a scale parameter instead of a rate parameter. They are reciprocals of one another.
The object gammaDistribution is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Probability.m2:1173:0.