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This article describes qregsel, a Stata module to implement a copula-based sample selection correction for quantile regression recently proposed by Arellano and Bonhomme (2017).

I find a significant incumbency advantage in municipal elections only after the reform implemented in 2016.

How to estimate a micro compliance function using group's nonresponse rates in Stata.

The divided tax reduction affected the price drop ratios, consistent with the clienele effect hypothesis.