Propensity scores as a basis for equating groups: basic principles and application in clinical treatment outcome research.

Abstract:

:A propensity score is the probability that a participant is assigned to the treatment group based on a set of baseline covariates. Propensity scores provide an excellent basis for equating treatment groups on a large set of covariates when randomization is not possible. This article provides a nontechnical introduction to propensity scores for clinical researchers. If all important covariates are measured, then methods that equate on propensity scores can achieve balance on a large set of covariates that mimics that achieved by a randomized experiment. We present an illustration of the steps in the construction and checking of propensity scores in a study of the effectiveness of a health coach versus treatment as usual on the well-being of seriously ill individuals. We then consider alternative methods of equating groups on propensity scores and estimating treatment effects including matching, stratification, weighting, and analysis of covariance. We illustrate a sensitivity analysis that can probe for the potential effects of omitted covariates on the estimate of the causal effect. Finally, we briefly consider several practical and theoretical issues in the use of propensity scores in applied settings. Propensity score methods have advantages over alternative approaches to equating groups particularly when the treatment and control groups do not fully overlap, and there are nonlinear relationships between covariates and the outcome.

journal_name

J Consult Clin Psychol

authors

West SG,Cham H,Thoemmes F,Renneberg B,Schulze J,Weiler M

doi

10.1037/a0036387

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

906-19

issue

5

eissn

0022-006X

issn

1939-2117

pii

2014-12451-001

journal_volume

82

pub_type

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