*rdrobust* is the workhorse library for nonparametric estimation and inference in [[Design Pattern II - Regression Discontinuity (RD)|regression discontinuity]] designs. It is available for both R and Python (and Stata). The implementation follows Calonico et al. (2014): local polynomial regression at the cutoff with data-driven bandwidth selection and bias-corrected robust inference.[^1] [^1]: Calonico, S., Cattaneo, M. D., & Titiunik, R. (2014). Robust nonparametric confidence intervals for regression-discontinuity designs. *Econometrica*, 82(6), 2295-2326. > [!info]- Last updated: May 13, 2026