The reference category is aliased with the constant term in the default contr.treatment contrasts.
See ?contr.treatment , ?C, ?contrasts If you don't know what this means, you should probably consult a local statistical resource or ask about linear model contrasts at a statistical help website like stats.stackexchange.com. This list is for R programming questions. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Mar 15, 2016 at 1:27 PM, Michael Artz <michaelea...@gmail.com> wrote: > Hi, > I am trying to use the summary from the glm function as a data source. I > am using the call sink(<some file>) then > summary(logisticRegModel)$coefficients then sink(). The independent > variables are categorical and thus there is always a baseline value for > every category that is omitted from the glm output. I am interested in how > to get the Z column for all of the categorical values. I don't see any row > for the reference category. How can I get this Z value in the output? > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.