I would like some advice on how if possible, to test the following I have subjects each measured several times. The subjects are sampled from 3 subpopulations (groups). The question is "Is the between-subject variance the same for the three groups?"
The "null" model is lme0 <- lme(y~group,random=~1|subject) I did think that the model that defined a specific between-subject variance for each group was update(lme0,.~., weights=varIdent(form=~1|group)) but I am not sure. I would appreciate any help. Ross Darnell ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
