[R] Logistic Regression output baseline (reference) category

Bert Gunter bgunter.4567 at gmail.com
Tue Mar 15 21:46:27 CET 2016

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.


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 <michaeleartz at 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 at 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.

More information about the R-help mailing list