Re: [R] glm poisson and quasipoisson

2013-02-01 Thread Ivan-K
I am sure, that this is not a pure Poisson! Huge overdispersion! You get inflated confidence intervals! (although, the point estimates of the regression coefficients stay the same) Try to look for the causes of overdispersion! It may be geteroscedastisity? What is the nature of the response, is it

Re: [R] Relative Risk in logistic regression

2013-02-01 Thread Ivan-K
Dear colleagues, I have 2 points: One opinion and one question. 1) In one paper in a peer-reviewed journal, I read about the idea of using a logit regression as a surrogate for the log-binomial, just adding the numerator to the denominator ... It’s tempting to immediately get the RR instead of OR