The Toolkit for Weighting and Analysis of Nonequivalent Groups, or TWANG, contains a set of functions to support causal modeling of observational data through the estimation and evaluation of propensity score weights. TWANG has been released as a package in R, and as downloadable macros for SAS users. The team has also released a series of tutorials intended to guide analysts using the toolkit for the first time.
RAND statisticians work on a variety of projects across its various research units. The projects listed here are examples of ones that have a particular focus on statistical methodology. For a comprehensive view of the RAND research projects in which statisticians are involved, see the Publications page.