Sorry, I guess that less-than, greater than are not allowed directly in posts. In Maple10/11 there is the new statistics package, which is pretty cool. And there are lots of examples on how to create a custom continuous distribution, but not on creating custom discrete distributions. for example: U := Distribution(PDF = (t -> piecewise(t < 0, 0, t < 3, 1/3, 0))); Is a great example of creating a continuous distribution, but how can I create something similiar that is discrete? Any examples are appreciated!! Thx Cameron