How to include multiple random effects in a 'lme' function?
For example, I want to set up 'days' and 'subject' as my random effects,
library(nlme)
fm - lme(trait~time+money, random=~days|subject, data=example)
However, if I have the following SAS code:
--
proc mixed data=example; class time money;
model trait=time money time*money/noint s;
random days/sub=subject;
random int/sub=pedigreeID;
title 'random slope model with family effects';
run;
In this SAS code, it has multiple random effects, how can I convert this SAS
code to R code?
library(nlme)
fm - lme(trait~time+money, random=list(???), data=example)
How should I fill up the list()?
thank you very much,
Karena
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