[R-sig-eco] nlme model specification

[Ruben Roa Ureta]

> Hi David,
>
> Thank you for the response.  A few comments below.

[snip]

> I think you're right that there is some shaky ground here, and Doug
> Bates has pointed out some issues on the R-sig-mixed-models list (I
> can't seem to find the thread right now).  One of the issues is that
> mixed models are generally fit with REML, which is not ML and
> therefore does not technically conform to the derivations of the *IC.
> If you fit a mixed model with ML instead, bias is introduced.

Bates think that the maximum log likelihood is not a problem with mixed
models when fit using ML:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/117488.html
though he does see a problem with the counting of parameters.
Sorry if I am a bit lost coming late to this thread.
R.