Thanks. The reason I responded that way is that the error message mentioned a function gendata that is in the rms and Design packages. I guess it's in the contrast package too. Frank
MarylinBejarano wrote: > > Hi, > > Sorry! I fited model with gls of nlme package. And I trying to contrast > interaction with function contrast of contrast package. > > I thanks for your reply, > > Regards. > > Marylin Bejarano > ----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/contrast-package-with-interactions-in-gls-model-tp3751255p3753135.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.