These are **not** odd results. You just don't understand how linear models work, in particular, you need to understand contrasts for categorical factors.
As this is not the place for a statistics tutorial, I suggest you read up on linear models or consult a local expert. Cheers, Bert On Tue, Sep 3, 2013 at 11:51 AM, Soumitro Dey <soumitrod...@gmail.com>wrote: > Dear all, > > I am encountering some odd results from the summary(object) command for > coxph and hurdle models. In both cases the result of summary(object) > function leaves out one of the categories of a categorical variable used in > the model. It is typically the first category if sorted alphabetically. Is > there any way around this problem? > > For example, if I have categorical variable "type" with values {A,B,C,D,E}, > it typically leaves out A in the result of the summary. > > Thanks! > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm [[alternative HTML version deleted]] ______________________________________________ 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.