[R] logistic regression

[Kim Mouridsen]

Dear R-experts

A binary response is observed for patients receiving one of three different 
drugs injected in different doses. That is for each drug (treatment) we have a 
dose-response model. Additionlly the patient's age and gender is recorded.

Initially I ran three logistic regressions, one for each drug type with gender 
as categorical variable and age and dose as continuous variables. If I want to 
know the effect of, say, gender on the response I now have three odds ratios - 
one for each dose response model.

My question is: How can I compare the three odds ratios? Is it possible in R 
to combine the three dose-response models into a single model to get an 
overall estimate of the effect of age?
Can I do something like
lr <- glm(vom ~ therapy*age + therapy*gender + 
therapy*cisdose+therapy*cardose+therapy*cycdose,family=binomial,data=emrisk)

Thanks in advance!
Kim Mouridsen.

_________________________________________________________________________
OFiR Spil - Vind 1.000 vis af kroner! Besøg http://spil.ofir.dk
OFiR Kontakt - Find en at dele julen med - Besøg http://kontakt.ofir.dk