Dear Stata users,
I am working on a paper that includes a logistic regression (logistics command for OR, vce(cluster Country)). A reviewer suggested to include an interaction effect which I did with the following command:

margins, dydx(VAR!) at(VAR2=(1(1)3))

initiator has 4 categories, but I want to include the fourth because it has only 2 cases. I'm not sure how to describe that in the justification for the reviewer and I'm not sure if I run into any fundamental problems I'm not thinking about att the moment. Any help or a literature suggestions about a similar case is appreciated.

Best Anna