Propensity Scores for Repeated Treatments

A Tutorial for the iptw Function in the TWANG Package

by Lane F. Burgette, Beth Ann Griffin, Daniel F. McCaffrey

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This tutorial describes the use of the TWANG package in R to estimate inverse probability of treatment weights (IPTWs) when one has time varying treatments or sequences of treatments over time. Specifically, it describes the "iptw" function (which stands for Inverse Probability of Treatment Weight), the proper syntax for using the function, and the features the function contains.

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