Hi I am working on logistic regression . I have 4 independent variables. I modelled using all of them first , second iteration with 3 and 2 and last iteration with 1. But there wasn’t any change AIC ,SC values in all the cases. However there was impact on concordance. Can some one please tell what are other goodness of fit test we can run to be more confident of findings.
Also can someone please suggest a book for predictive analysis .