Hello,

I am doing some statistical analysis of variance on a dataset (catch data from fisheries) with many zero's (50%) and with non zero values that are log-normally distributed. From literature I read that the delta distribution (Pennington, 1983) is a good way to describe these kind of distributions and to calculate an good estimate of the mean and variance. I want to do a analysis of variance using this distribution. Has anybody ever tried to program this in SAS. Or does anybody have an idea how I can simultaneously analyse the zero-non zero catches (catch probability as presence absence data) and the non-zero catches (lognormally distributed) in an analysis of variance. Can anyone of you help me with this?? Thanks very much in advance.

Hans van Oostenbrugge Hans.vanoostenbrugge@alg.venv.wau.nl