Hello, I am writing to inquire whether anybody has knowledge of information regarding the following problem. I cannot find it discussed in any of the books/articles that I possess and any info regarding the fundamental properties and an appropriate random number generator for the resulting distributions would be appreciated. I apologise if I have missed the boat and this is a trivial query. If a phenomenon behaves according to a poisson process, then the average arrival rate is lamda (l) and the time between events (t) is exponentially distributed. It seems to me that a relatively common occurrence might be that one has a time period of observation during which no events occurred and you would like to estimate, given this value as a minimum estimate for (t), the most probable value for (l). I thought that the resulting set of distribution functions might have their properties described in a book on distributions or similar, but I cannot find this information. Any help much appreciated Chris Keylock ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%