Hi Anna, In the geeglm help file, it states "Data are assumed to be sorted so that observations on a cluster are contiguous rows for all entities in the formula."
I'm not sure if you are asking how to sort data, or how your data should be sorted. If your data come from a data frame called dat, it could be done in this way: dat <- dat[order(dat$Route), ] geeglm(Pass~Distance, id=Route, corstr="ar1") I think you only need to sort by the id variable. If you need to sort by two variables, you can add them to the order function: dat[order(dat$Var1, dat$Var2), ] I would think you may want to include the day or time as model covariates, but it would depend on the nature of the problem. Hope this is helpful, JoAnn -- View this message in context: http://r.789695.n4.nabble.com/GEE-order-of-data-tp3248588p4650343.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
