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 <soumitrodey1@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

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