Syntax: Poi(mean, stream)
The Poisson distribution (discrete) with mean = m is the distribution of the number of customers that arrive to some system in any time interval of length 1 when the interarrival times have an exponential distribution (continuous) with mean = 1/m. Mean must be greater than 0.0.
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.