Hi Antonella,
I think that lme4 does not have yet corStruct classes available, at least for the currect version for Windows which I have. So I'd suggest you to use the nlme package.
I hope it helps.
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/336899 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "Antonella Plaia" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, December 14, 2004 2:57 PM
Subject: [R] correlation in lme4
Dear all,
I have tried to consider a correlation structure in lme (package lme4), but
without success.
I have used something like:
risul<-lme(y~x+ z , data=mydata, random=~ x | g, correlation = corAR1())
but the result is the same as:
risul<-lme(y~x+ z , data=mydata, random=~ x | g).
Can anybody help me?
Antonella
************************************************** Prof. Antonella Plaia Dipartimento di Scienze Statistiche e Matematiche "S. Vianelli" Universit� di Palermo Viale delle Scienze 90128 Palermo ITALIA Tel. +39 091 6626244 Fax +39 091 485726 http://dssm.unipa.it/plaia e-mail:[EMAIL PROTECTED]
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