Box-Cox Symmetric Regression for Non-Negative Data // A collection of tools for regression analysis of non-negative data, including strictly positive and zero-inflated observations, based on the class of the Box-Cox symmetric (BCS) distributions and its zero-adjusted extension. The BCS distributions are a class of flexible probability models capable of describing different levels of skewness and tail- heaviness. The package offers a comprehensive regression modeling framework, including estimation and tools for evaluating goodness-of-fit.