gkwreg: An R Package for Generalized Kumaraswamy Regression Models for Bounded Data

gkwreg is an R package for fitting regression models to data restricted to the unit interval (0, 1), such as proportions, rates, and indices.The package implements the flexible five-parameter Generalized Kumaraswamy (GKw) distribution and its seven main subfamilies, including the widely used Beta and Kumaraswamy distributions.A key feature of gkwreg is its use of the Template Model Builder (TMB) framework, which leverages automatic differentiation and C++ templates to provide fast, stable, and accurate maximum likelihood estimation.This overcomes the significant computational challenges typically associated with such complex multiparametric models, making them accessible for practical application.The package provides a user-friendly interface with standard R methods for model specification, inference, and diagnostics.