Hello everyone, I am running two multiple linear regression models where the first one needs to have an interaction term between the dummy variable female (1 = female, 0=male) and a categorical variable beauty. The first model needs to have the interaction term between female and beauty, and the second one between male and beauty. I've read that i.female##c.beauty will give me the interaction term between the two variables but how should I write the regress in order to have an interaction term between female and beauty and male and beauty? I have tried the following: for the model with the interaction term between female and beauty I used regress with 1.female##c.beauty and 0.female##c.beauty for the second model but I don't know if this is the correct way to write it and if this is giving me the results I want. I also don't really understand the difference between # and ##.