Hi again,

So yesterday I finished off reading the first few chapters of Kleinbaum - an excellent book on Logistic regression. The only trouble is that this text seems to concentrate on everthing apart from what variables should be considered in a model. I now know that a general model takes "the shape" of an model, i.e. it has exposure variable(s) E of interest, confounders and interaction confounders. My task now is to decide which variables are the confounders and interaction confounders (?)... but first I obviously need to decide what hypothesis I am testing so I can decide on my exposure variable(s)... right? A the task of deciding confounders is mention in the text you gave above (the stuff on nuisance variables and the "logit" approach in SPSS)?

Thanks,

Ldawg5962