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st: what to do with this distribution

From   David Airey <[email protected]>
To   [email protected]
Subject   st: what to do with this distribution
Date   Tue, 21 Oct 2003 14:40:26 -0500

Dear List,

I have a distribution I want to predict from a categorical predictor with 3 levels. The predicted variable are scores on the health of the GI tract, one from each mouse. The distribution of scores has a good number of mice that are normal and a good number that are abnormal. The abnormal mice are variably so, with a positive skew. The additional complication I have is that only extremes of the abnormal mice (high and low tails of the abnormal distribution) were selected to gather predictor data. So there are actually three groups of mice--normal, variable low scoring, and variable high scoring. I can think of using two models, one that compares normal versus abnormal, and another that compares scores within abnormal mice, but what uses all the data and the division in the abnormal mice? Would this be a case for ologit? I've never had the opportunity to use ologit, yet.



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