Hello everyone,
I am estimating Taylor rules of monetary policy using GMM and "gmm" command (Stata 14). I only estimate a single equation with a valid instrument set based on the J-Test, but the GMM output does not give me an R-squared or an adjusted R-squared.The point is that all the literature that uses GMM for Taylor estimates presents a very reasonable R-squared data, but I don't know how. The only alternative way is "ivregress command" but it does not allow to estimate equations.

Is there a way to get or calculate the R-squared in a GMM regression?

Thank you.