Hey everyone. I am currently doing some regressions for subsamples of my original sample where an indicator equals 1 for the first regression and 0 for the second regression. What test do I have to use, to test for the significance of the two resulting coefficients?

It is not clear what you are doing. You are running one regression model, what type (linear, logistic, etc.), and you have a binary or categorical term in the model? Provide more detail, please.

I´m running a linear regression model. The variable I want to use to build the subsample is binary (either 0 or 1).

Edit: I think it´s easier to show what I mean with two screenshots. I want to test whether the difference in the two estimates of POST =1 is statistically significant.