I'm having difficulty interpreting the interaction term is a linear regression. I'm using two dichotomous variables, for instance 1 or 0 for gender and 1 or 0 for type of class - active or passive, coded as 1 or 0. The stata results reported the result for when the two variables are both 1, which is male 1 and active class 1. However, the coefficient estimate are 0 for all other cases (male 1 and passive class 0; female 0 active class 1; female 0 passive class 0).
I think the results are telling me that one variable - type of class only explains the variation explained by gender only in the case when the gender is male. Am I wrong? If I am right, is there value to such analysis? I currently think there is, but I am also not sure why stata reports 0 for the rest of the cases.