This repository contains all code for running simulations and analyses for the paper “Out-of-sample $R^2$: estimation and inference” by Stijn Hawinkel, Willem Waegeman and Steven Maere published in The American Statistician, which can be found here. The methodology for calculating out-of-sample $R^2$ and its standard error is available in the R-package oosse on CRAN. It can be installed as:

install.packages("oosse")