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650
2004 Jul 20
1
Performance problem
Dear all,
I have a performance problem in terms of computing time.
I estimate mixed models on a fairly large number of subgroups (10000) using
lme(.) within the by(.) function and it takes hours to do the calculation
on a fast notebook under Windows.
I suspect by(.) to be a poor implementation for doing individual analysis
on subgroups.
Is there an alternative and more efficient way for doing