"varFunc" classes
Dear Dan, You are looking for the nlme package. Best regards, Thierry ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance Kliniekstraat 25 1070 Anderlecht Belgium To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey 2016-12-13 9:48 GMT+01:00 Dan Jackson <dan_476 at hotmail.co.uk>:
Dear lme4 authors,
I am sure you are very busy so I will just ask my question very quickly. I
was reading the book "Mixed-effects models in S and S-plus" by Pinheiro and
Bates. On the top of page 208 of this book, there is a Table 5.1 that
implements various "varFunc" classes. One of these classes would seem to be
what I need for my data: varIdent - different variances per stratum. I do
know that different subets in my data have very different variances you
see,
so I would need to include this.
However this book relates to S-plus and I am not sure if this has been
implemented in R, in the glmer package? My data are continuous so I would
just need this for lmer (and not glmer). If it has not been implemented is
there any "workaround"?
Thanks in advance for any advice, Dan Jackson
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