Covariate Selection in Propensity Scores Using Outcome Proxies

Autor/in	Kelcey, Ben
Titel	Covariate Selection in Propensity Scores Using Outcome Proxies
Quelle	In: Multivariate Behavioral Research, 46 (2011) 3, S.453-476 (24 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0027-3171
Schlagwörter	Probability; Scores; Predictor Variables; Selection; Statistical Analysis; Statistical Bias + Suchen Sie Ihr Suchwort? Wahrscheinlichkeitsrechnung; Wahrscheinlichkeitstheorie; Prädiktor; Auslese; Statistische Analyse
Abstract	This study examined the practical problem of covariate selection in propensity scores (PSs) given a predetermined set of covariates. Because the bias reduction capacity of a confounding covariate is proportional to the concurrent relationships it has with the outcome and treatment, particular focus is set on how we might approximate covariate-outcome relationships while retaining the PS as a design tool (i.e., without using the observed outcomes). To make this approach tractable, I examined the extent to which alternative measures of the outcome might inform covariate-outcome empirical relationships and corresponding covariate selection. Specifically, two such measures were examined: proximal pretreatment measures of the outcome and cross validation. Further, because the implications of covariate choice reach beyond the properties of the treatment effect estimator, I reason that the primary objective of PS covariate selection is to effectively and efficiently reduce bias while forming a scientific basis for inference through, for example, covariate balance. By using outcome proxies or cross validation, substantive knowledge is augmented with empirical evidence of covariates' bias reduction/amplification capacities to better inform covariate selection, improve estimation, and form an evidentiary basis for inference. (Contains 1 figure, 1 footnote, and 2 tables.) (As Provided).
Anmerkungen	Psychology Press. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site: http://www.tandf.co.uk/journals
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10