[R] lme problem
bates at stat.wisc.edu
Thu Mar 25 20:45:39 CET 1999
>>>>> "John" == John Logsdon <j.logsdon at lancaster.ac.uk> writes:
John> Hi I am trying to get to grips with lme and perhaps the
John> euro-cent is not dropping. I want to define a model with some
John> terms random and some fixed so that:
John> defining by the group c in data frame df, whereupon
John> where I want the t as a random effect and the f as the fixed
John> Without the f it works OK but when I add the f, I get an error
John> message from model.frame saying there is an error in the
John> lengths. As far as I can see, all the lengths are the same
John> (and I have checked it with length() of course).
John> Is there an obvious reason for this? I am probably doing
John> something stupid but it escapes me at the moment. I will try
John> and do the same with MLn this evening ...
What you are doing looks reasonable. Since the version of lme in the
R library is rather old it is possible that the fault lies in the
lme code rather than in your understanding of the lme code.
Jose' Pinheiro and I had a chance to talk with many of the R
developers at the Vienna conference and I think we understand much
better now how to modify the current lme code for use with R. We hope
to bring the lme library in R up-to-date with the beta version of
nlme-3.0 for S-PLUS but we can't promise a release date on that yet.
Could you send us a transcript of your session including the output of
after you get the error condition? That could help a lot tracking
down the problem.
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