Syntax: Gam(mean, shape, stream)
The gamma distribution (continuous) could be used to model the time required to perform some task. If a gamma distribution has parameters mean = m and shape = a, then b = m/a is a scale parameter. A gamma distribution with mean = m and shape = 1 is an exponential distribution with mean = m. When shape is a positive integer, the gamma distribution is an Erlang distribution. Parameter restrictions are mean >= 0.0 and 0.0 < shape < 100.0.
Stream allows you to specify the random number stream for the distribution. There are 215 streams. Stream 1 is the default. See Seeds or Appendix D of the User's Guide for more information.