Gui R, Meierer M, Schilter P, Algesheimer R. REndo: Internal Instrumental Variables to Address Endogeneity. J. Stat. Soft. [Internet]. 2023 Sep. 9 [cited 2024 Nov. 23];107(3):1-43. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v107i03