>>>>> "HaroldD" == Doran, Harold <[EMAIL PROTECTED]>
>>>>> on Wed, 8 Feb 2006 08:01:03 -0500 writes:
HaroldD> ................
HaroldD> A few thoughts, first, use lmer in the Matrix
HaroldD> package and not in lme4.
Well, that's potentially misleading advice: If both lme4 and
Matrix are (more or less) current, it is actually better to call
library(lme4) if you want to use lmer() .
A more extensive advice + explanation :
- "lme4" is the package you should use when using lmer().
Using "Matrix" *instead* works as well *currently*
(and yes, *currently* lmer is in the Matrix namespace).
- At the moment, "lme4" is an almost empty wrapper around using
package "Matrix", since the C code for lmer() needs to be
able to call C code inside "Matrix" and that is not yet
portably possible.
For that reason, everything for lmer() is currently inside
"Matrix", but that should change when R will have the
infrastructure for R packages to export their C API such that
other R packages can reliably use that C API.
HaroldD> ................
HaroldD> Last, a colleague and I have a paper in press
HaroldD> showing how to fit models using lme which we
HaroldD> submitted a year or so ago.
HaroldD> Since lme has evolved to lmer, we created an
HaroldD> appendix that translates all of our lme models to
HaroldD> the lmer syntax so readers can see equivalences. I
HaroldD> am happy to send this to you (or others) upon request.
That sounds quite interesting; I'll be glad to receive it as
well.
Martin Maechler, ETH Zurich
HaroldD> http://cran.r-project.org/doc/Rnews/Rnews_2005-1.pdf
HaroldD> Harold
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