Bias-Reduced and Penalized Generalized Estimating Equations // Fits marginal regression models for repeated or clustered responses using generalized estimating equations (GEE). Provides ordinary GEE estimators, bias-reduced and bias- corrected GEE estimators, and Jeffreys-type penalized GEE estimators for binary, count and continuous responses. Methods are described in Touloumis (2026a) doi:10.48550/arXiv.2606.16043 and Touloumis (2026b) doi:10.48550/arXiv.2606.16058.