> Why not use the subset option? Something like: > > lm(diff ~ Age + Race, data=data, subset=data$Meno=="PRE")
> should do the trick, and be much easier to read! "data$" could be omitted, simply lm(diff ~ Age + Race, data=data, subset=Meno=="PRE") ______________________________________________ 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.
