is denoted by continuous probability distribution Gamma distribution Philippe Rocca-Serra Alejandra Gonzalez-Beltran Orlaith Burke A gamma distribution is a general type of continous statistical distribution (related to the beta distribution) that arises naturally in processes for which the waiting times between Poisson distributed events are relevant. Gamma distributions have two free parameters shape k and scale denoted theta . Alejandra Gonzalez-Beltran Philippe Rocca-Serra dgamma(x, shape, rate = 1, scale = 1/rate, log = FALSE) http://stat.ethz.ch/R-manual/R-patched/library/stats/html/GammaDist.html http://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.gamma.html#scipy.stats.gamma http://mathworld.wolfram.com/GammaDistribution.html probability distribution scale parameter probability distribution shape parameter ready for release