Variance Function Panel Regression R package xtvfreg version 1.1.0 Implements an iterative mean-variance panel regression estimator that allows both the mean and variance of the dependent variable to be functions of covariates. The method alternates between estimating a mean equation (using generalized linear models with Gaussian family) and a variance equation (using generalized linear models with Gamma family on squared within-group residuals) until convergence. Based on the methodology in Mooi-Reci and Liao (2025) <doi:10.1093/esr/jcae052>. Software Depends: R (>= 3.6.0) Imports: stats, rlang Suggests: haven, ggplot2, knitr, gt, modelsummary Tim F. Liao <tfliao@illinois.edu> Comprehensive R Archive Network (CRAN) Tim F. Liao [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=xtvfreg/LICENSE) 2025-11-26 application/tgz https://CRAN.R-project.org/package=xtvfreg doi:10.32614/CRAN.package.xtvfreg