I am wondering how many subsample ways or to get estimates for some sub-categories of the data without sub-sampling.
So far I know two approaches:
1> We can divide the whole sample into two subsamples and run the same main regression equation for these two subsamples and then comparing the coefficients of the variable of interest.
2> We can add the interaction between dummy representing for one subsample and the variable of interest like this.
I am wondering if we have any other way to do subsample?