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Sociological Methods & Research, Vol. 34, No. 3, 263-295 (2006)
DOI: 10.1177/0049124105283119

An Introduction to Ensemble Methods for Data Analysis

Richard A. Berk

University of California, Los Angeles

This article provides an introduction to ensemble statistical procedures as a special case of algorithmic methods. The discussion begins with classification and regression trees (CART) as a didactic device to introduce many of the key issues. Following the material on CART is a consideration of cross-validation, bagging, random forests, and boosting. Major points are illustrated with analyses of real data.

Key Words: CART • data analysis • algorithmic methods • ensemble methods


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