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.
Statisticians at RAND
“The RAND Corporation, America's original think tank, earns its money fishing truths out of murky political and social waters. The quantitative conscience of RAND, often the final arbiter of what constitutes the true story, is its small but powerful Statistics Group.”
Bradley Efron, Stanford University, from the Foreword to
Public Policy and Statistics: Case Studies from RAND, Springer-Verlag, 2000.
Who We Are
The RAND Corporation is a nonprofit research organization providing objective analysis and effective solutions that address the challenges facing the public and private sectors around the world (see About RAND). The RAND Statistics Group was established in 1976 to “enhance the quality of RAND research by making statistical expertise easily available to all members of the research staff.” The RAND Statistics Group currently has 12 Ph.D. and 7 Master's-level statisticians. Group members are based in all three of RAND's principal United States locations: Santa Monica, California, Washington, D.C., and Pittsburgh, Pennsylvania (see Contacts and Locations). The head of the group is Lou Mariano (Lou_Mariano@rand.org).
What We Do
Group members contribute as full collaborators to projects in all of RAND's research areas (see Research Areas). Motivated by real-world policy questions, RAND research projects provide diverse, stimulating, and challenging research opportunities for statisticians. RAND's research teams are typically interdisciplinary, drawing upon methods from statistics and other fields to tackle these policy problems.
Statisticians conduct research and development of statistical methodology that is essential for RAND to remain at the cutting edge of policy analysis. The group provides short-term statistical consulting for all RAND projects, especially those without a statistician on the team. Additionally, the group provides continuing statistical education to all RAND employees through short courses (offered at no cost to participants) and a regular seminar series.
Statistics Group members publish on statistical methods and applied problems in academic journals, edited volumes, books, and reports refereed and published by RAND (see Statistics Group Publications for a list of recent Group publications). They serve on national panels and committees, and assume leadership roles in many of the American Statistical Association's committees and sections as well as serving on editorial boards for leading journals such as The Annals of Applied Statistics, Journal of Educational and Behavioral Statistics, and Public Opinion Quarterly.