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Following the literature on local maximum likelihood estimation, our method considers a weighted set of nearby training examples; however, instead of using classical kernel weighting functions that are prone to a strong curse of dimensionality, we use an adaptive weighting function derived from a forest designed to express heterogeneity in the specified quantity of interest. We propose a flexible, computationally efficient algorithm for growing generalized random forests, develop a large sample theory for our method showing that our estimates are consistent and asymptotically Gaussian and provide an estimator for their asymptotic variance that enables valid confidence intervals. We use our approach to develop new methods for three statistical tasks: nonparametric quantile regression, conditional average partial effect estimation and heterogeneous treatment effect estimation via instrumental variables. A software implementation, grf for R and C++, is available from CRAN.<\/jats:p>","DOI":"10.1214\/18-aos1709","type":"journal-article","created":{"date-parts":[[2019,1,11]],"date-time":"2019-01-11T04:01:41Z","timestamp":1547179301000},"page":"1148-1178","source":"Crossref","is-referenced-by-count":1578,"title":["Generalized random forests"],"prefix":"10.1214","volume":"47","author":[{"given":"Susan","family":"Athey","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julie","family":"Tibshirani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Wager","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"108","reference":[{"key":"1","doi-asserted-by":"publisher","unstructured":"Abadie, A. (2003). Semiparametric instrumental variable estimation of treatment response models. <i>J. 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