Andreas Cordes <andreas.cordes <at> stud.uni-goettingen.de> writes:
> > Hi, > I would like to fit a model for a factorial design that allows for > unequal variances in all groups. If I am not mistaken, this can be done > in lm by specifying weights. > A function intended to specify weights for unequal variance structures > is provided in the nlme library with the varIdent function. Is it > apropriate to use these weights with lm? If not, is there another > possibility to do factorial designs with heteroscedasticity? No, varIdent and friends is made for use with mixed effect models in package nlme. Dieter ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
