This repository is preserved for the purpose of replicating the experiments from:
Stefan Wager and Susan Athey. Estimation and Inference of Heterogeneous Treatment Effects using Random Forests. 2015. [arxiv]
For an actively maintained version of the present software, with a focus on causal trees, see https://github.com/susanathey/causalTree. A more scalable version of causal forests, built in C++, is under development.