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- M M Joffe and P R Rosenbaum.
- Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia 19104-6021, USA.
- Am. J. Epidemiol. 1999 Aug 15; 150 (4): 327-33.
AbstractThe propensity score is the conditional probability of exposure to a treatment given observed covariates. In a cohort study, matching or stratifying treated and control subjects on a single variable, the propensity score, tends to balance all of the observed covariates; however, unlike random assignment of treatments, the propensity score may not also balance unobserved covariates. The authors review the uses and limitations of propensity scores and provide a brief outline of associated statistical theory. They also present a new result of using propensity scores in case-cohort studies.
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