Hi there,
I am fitting a model using the lme function. I am using weights=varIdent to fit a variance model with different variances for each level of a stratification variable.Can someone please tell me how to chance the reference level of the stratification variable? I have tried changing the reference level of the factor, and tried re-ordering the data frame so that the first observation has the level that I want to use as the reference level, but neither have worked.
Emma
	[[alternative HTML version deleted]]

