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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.
Percent Point Function. The formula for the percent point function of the gamma distribution does not exist in a simple closed form. It is computed numerically. The following is the plot of the gamma percent point function with the same values of Î³ as the pdf plots above.