Propensity score methods for bias reduction in the comparison of a treatment to a non-randomized control group.

@article{DAgostino1998PropensitySM,
  title={Propensity score methods for bias reduction in the comparison of a treatment to a non-randomized control group.},
  author={Ralph B. D'Agostino},
  journal={Statistics in medicine},
  year={1998},
  volume={17 19},
  pages={2265-81}
}
In observational studies, investigators have no control over the treatment assignment. The treated and non-treated (that is, control) groups may have large differences on their observed covariates, and these differences can lead to biased estimates of treatment effects. Even traditional covariance analysis adjustments may be inadequate to eliminate this bias. The propensity score, defined as the conditional probability of being treated given the covariates, can be used to balance the covariates… CONTINUE READING
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