Thanks Doc@Duke
I thought you might be right so I loaded SAS onto my more powerful home PC, re-ran the regression and got the same error message, but then the guy I share a desk with asked me why I was including the strata variable in the class statement when, actually, the strata are the chronological order in which the data were collected and, so, are ordinal.
I took the strata variable DivNum out of the class statement and voila... it works.
Thanks again - at last... the end is in sight.
Peter Buzzacott
Final stage of a PhD
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