GSOC Work Product

Introduction T his summer I worked on the loo package as part of the Google Summer of Code 2025. The loo package is widely used to cross-validate Bayesian models and has over three million downloads and several thousand citations to date. This project is under Stan ⁠ , which is sponsored by the NumFocus ⁠ organization. My goals for the project were to create extend the package API by creating a…