David Winsemius wrote:
>
>
> ...
>
> Perhaps:
>
> by(data2, data2$grp, function(x) step(lm(model, data=x)))
>
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>
Perhaps .... ;) You know of course that this worked. It took a moment to
understand the screen output because each case gets dumped one after the
other but finding the string "Start:" cleared up the confusion. Thanks for
the solution.
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