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i am want to carryout a longitudinal analysis similar to the proc catmod in SAS using The Weighted least squares method.my data is in the following format. Material time1 time2 time3 1 1 1 1 1 1 2 2 2 2 2 3 3 3 . . . . 13 what i want to do is compare if there is a significant difference between the materials. and also if there is any sig difference between the times. any help will be greatly apreciated thanks [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.