I'm having difficulty getting the augPred function from the nlme package to work when the primary covariate is a factor. I don't know if it is intended to work in these situations, but I can't immediately see anything in the documentation that forbids this - ideally I'd like to be able to plot the results just like I can for numeric primary covariates. Many thanks - Gavin Kelly (Cancer Research UK, Bioinformatics & Biostatistics)
> library(nlme) > fm <- lme(ergoStool) > augPred(fm) Error in Summary.factor(c(1L, 2L, 3L, 4L, 1L, 2L, 3L, 4L, 1L, 2L, 3L, : min not meaningful for factors > sessionInfo() R version 2.9.1 (2009-06-26) i386-pc-mingw32 locale: LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United Kingdom.1252;LC_MONETARY=English_United Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] nlme_3.1-92 loaded via a namespace (and not attached): [1] grid_2.9.1 lattice_0.17-25 ______________________________________________ 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.