Hey,
I'm about to examine how a two-way interaction differs depending on the country (I examine three countries). Are the two possible ways to do this either to run a three-way interaction with a dummy for each country as the third variable or is it preferable to do it in a multilevel analysis? Wouldn't I need two make it into a three-way interaction also in a multilevel since I'm interested whether the interaction differs depending on the country.

All the best,
Johan