Hello Chris,
as far as I know from the Pinheiro and Bates book "Mixed-Effects Models in S
and S-PLUS", the autoregressive parameter has to be specified only as
initial value for the estimation. That is, the parameter will be estimated,
but the result may depend on the prespecified value. You do no
On Tue, 14 Sep 2004, Chris Solomon wrote:
> Hello-
>
> I'm trying to do some repeated measures ANOVAs. In the past, using SAS,
> I have used the framework outlined in Littell et al.'s "SAS System for
> Mixed Models", using the REPEATED statement in PROC MIXED to model
> variation across time with
Yes. Try something akin to
> fm1<- lme(y~time, data, random=~time|ID)
> fm2<-update(fm1, correlation=corAR1(form~time|ID)
You can then use anova(fm1,fm2) to compare.
Harold
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