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Definition: Gamma distribution is a distribution that arises naturally in processes for which the waiting times between events are relevant. It can be thought of as a waiting time between Poisson distributed events. Probability density function: The waiting time until the hth Poisson event with a rate of change Î» is.
Definition of gamma. 1 : the 3d letter of the Greek alphabet â see alphabet table. 2 : the degree of contrast of a developed photographic image or of a video image. 3 : a unit of magnetic flux density equal to one nanotesla. 4 : gamma ray gamma counter.