[R] Syntax for crossed random effects in nlme

[Kingsford Jones]

Hi Ben,

Pinheiro and Bates 2000 is the "real" documentation for nlme.  See the
Cell Culture Bioassay example starting on pg 163 for a demonstration
of fitting crossed random effects using pdIdent and pdBlocked objects.

hth,
Kingsford

On Tue, Sep 1, 2009 at 6:44 AM, bamsel<benamsel at gmail.com> wrote:
>
> Hello R users,
> I've read the posts on this topic, and had a look at the R documentation for
> nlme, but I can't seem to make this work. I'd like to be able to fit a mixed
> effects model with crossed random effects, but also be able to specify the
> covariance matrix structure for the residuals. Here's the syntax using the
> lmer function in lme4 (which doesn't currently allow alternate error
> covariance structures). Does anybody know how to transform this to work with
> nlme?
>
> fit = lmer(data$DV ~ X + time + (X*time) + (1|Item_Number) + (1|Subject),
> data)
>
> Much appreciated,
> Ben Amsel
> --
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