[R] calculating odds ratio in logistic regression with interaction terms

[David Winsemius]

On Feb 7, 2013, at 10:58 AM, Aminreza Aamini wrote:

> Hi,
> I am comparing SAS commands with R.
> consider i want to assess the effect of one exposure(like CAT where 1
> equals high and 0 equals low) and one cofounding variable (like
> cholesterol leve,CHL) on a diseasee variable (like CHD).
> In SAS to get a numerical value for the odds ratio, consider, for
> example, the specific values CHL equal to 220 and HPT equal to 1 when
> the model contains interaction terms like (CC=CAT*CHL) the command
> is:
> 
> PROC GENMOD data=l2 DESCENDING;
> MODEL CHD=CAT CHL CC/LINK=LOGIT DIST=BINOMIAL;
> ESTIMATE CAT 1 CC 200 /EXP;
> RUN;
> 
> I just want to find such a command in R. Its not a homework.

But it _is_ asking an extremely question that would be more rapidly answered by simply typing "how to do logistic regression in R" in a search engine. (I know this because I just tried it.) Such questions are explicitly deprecated in the Posting Guide. You should also do further self-study by reading the Posting Guide, working through the "Introduction to R", and learning to use the help() system.

-- 
David.
> 
> Amin
> 
> 
> On Wed, Feb 6, 2013 at 9:46 PM, Bert Gunter <gunter.berton at gene.com> wrote:
> 
>> 1. Please do not double post.
>> 
>> 2. This is a statistics, not an R question. Post on a statistics list,
>> like stats.stackexchange.com instead.
>> 
>> 3. Is this a homework question? -- we don't do homework here.
>> 
>> -- Bert
>> 
>> On Wed, Feb 6, 2013 at 8:59 AM, Aminreza Aamini <amin.r.fan at gmail.com>
>> wrote:
>>> Dear all,
>>> 
>>> How can i obtain odds ratio in logistic regression when the model
>>> contains interaction terms in R?
>>> how can i obtain OR for a special case?
>>> Thanks in advance for any help.
>>> Amin
>>> 
>>> ______________________________________________
>>> R-help at 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 at 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.

David Winsemius
Alameda, CA, USA