[R] Kenward-Roger correction in lme
Ben Bolker
bolker at ufl.edu
Mon Feb 25 20:11:24 CET 2008
stian <at> mail.rockefeller.edu <stian <at> mail.rockefeller.edu> writes:
> Hi,I am wondering how to conduct Kenward-Roger correction in
> the linear mixed model using R. Any idea?
>
> Thanks a lot,
>
> Suyan
Not really possible, I'm afraid. Having already invested a huge
amount of time in making lme4 available (and this is the cutting-edge
version of linear mixed models for R), Doug Bates has declined to
spend effort implementing K-R because (1) he's not convinced of the
appropriateness of adjusting F-distribution degrees of freedom in
this way, (2) he doesn't think that the K-R algorithm will be
feasible for the sorts of large-data problems he's interested in,
(3) [can't find the reference] he finds the correspondence between
K-R's notation and his difficult.
This should probably go on an FAQ list somewhere:
By the way, RSiteSearch("Kenward-Roger") would have
yielded some information ...
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/81969.html
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/49633.html
For further information, please see the r-sig-mixed archives.
cheers
Ben Bolker
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