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A tutorial on propensity score estimation for multiple treatments using generalized boosted models

Almirall, Daniel; McCaffrey, Daniel F; Griffin, Beth Ann; Slaughter, Mary Ellen; Ramchand, Rajeev; Burgette, Lane F. (2013). A tutorial on propensity score estimation for multiple treatments using generalized boosted models. Statistics in medicine. 32(19), 3388-3414.