Syntax: Hex(mean1, mean2, probability1, stream)
The hyper exponential distribution (continuous) is a mixture of two exponential distributions. Specifically, a hyper exponential distribution with parameters mean1, mean2, and probability1 takes on values from an exponential distribution with parameter mean1 with a probability of probability1 and takes on values from an exponential distribution with parameter mean2 with a probability of 1 - probability1. A hyper exponential distribution with probability1 = 1 is an exponential distribution with parameter mean1. Parameter restrictions are mean1 >= 0.0, mean2 > 0.0, and 0.0 <= probability1 >= 1.0.
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.