Dear All, I'm trying to do 'glm' analysis by groups just like in SAS you use "by variable". I don't know how to do it in R, anyone can help with this? i.e.
group line rep value 1 1 1 0.2 1 1 2 0.3 1 1 3 0.23 1 2 1 0.2 1 2 2 0.3 1 2 3 0.23 2 1 1 0.2 2 1 2 0.3 2 1 3 0.23 2 2 1 0.2 2 2 2 0.3 2 2 3 0.23 in SAS we say: model value=line rep; by group; How can I do this in R? Thanks, Hongmei Jia ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
