The Toolkit for Weighting and Analysis of Nonequivalent Groups (twang
1.0) has been released to CRAN. The package collects functions useful
for computing propensity score weights for treatment effect estimation,
developing nonresponse weights, and diagnosing the quality of those
weights. The package includes a vignette containing some basic theory
and walks through two examples. It is available by typing
vignette("twang")
at the R prompt after loading the library.
Background on the methodology with an application to evaluating drug
treatment programs is available in
McCaffrey, D., G. Ridgeway, A. Morral (2004). "Propensity score
estimation with boosted regression for evaluating adolescent substance
abuse treatment," Psychological Methods 9(4):403-425.
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