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08 December 2006

Comments

Jill Horwitz

Here are two very useful citations for those who want to learn more about propensity scores:
Paul R. Rosenbaum & Donald B. Rubin, The Central Role of the Propensity Score in Observational Studies for Causal Effects, 70 Biometrika 41 (1983), Paul R. Rosenbaum & Donald B. Rubin, Reducing Bias in Observational Studies Using Subclassification on the Propensity Score, 79 Journal of the American Statistical Association 516 (1984).

I've used propensity scores as a sensitivity test (in published work and also in an article forthcoming in Yale J. Reg next month).

But like any method, it should only be used when there is good reason to think it will help explain data. In my case, I worried that my observations were correlated with a particular characteristic in such a way that controlling for that characteristic wouldn't be a sufficient.


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