Collapsibility Conditions for Multiway Tables

hlsmith

Less is more. Stay pure. Stay poor.
#2
Didn't quite follow your issue. ORs or HRs are the estimates that can differ between marginal estimates and conditional (stratified) estimates. In particular when using logistic regression and GLM.
 

spunky

Can't make spagetti
#3
I saw on the internet to let U be a composite variable consisting of combinations of levels of Y and Z; then, collapsibility conditions are satisfied as W is conditionally independent of U, given X.
Where on the internet did you see that?
 

hlsmith

Less is more. Stay pure. Stay poor.
#4
Yeah, I saw on the internet it is a non-linear transformation thing related to Jensen's inequality.