Propensity Score-Based Estimators with Multiple Error-Prone Covariates.

Published online

Journal Article

Propensity score methods are an important tool to help reduce confounding in non-experimental studies. Most propensity score methods assume that covariates are measured without error. However, covariates are often measured with error, which leads to biased causal effect estimates if the true underlying covariates are the actual confounders. Although some studies have investigated the impact of a single mismeasured covariate on estimating a causal effect and proposed methods for handling the measurement error, even fewer papers have investigated the case where multiple covariates are mismeasured, and none discussed correlated measurement errors. In this paper, we examine the consequences of multiple error-prone covariates when estimating causal effects using propensity score-based estimators via extensive simulation studies and real data analyses. We find that causal effect estimates are less biased when the propensity score model includes mismeasured covariates whose true underlying values are strongly correlated with each other. However, when the measurement errors are correlated with each other, additional bias is introduced. In addition, it is beneficial to include correctly measured auxiliary variables that are correlated with confounders whose true underlying values are mismeasured in the propensity score model.

Full Text

Duke Authors

Cited Authors

  • Hong, H; Aaby, DA; Siddique, J; Stuart, EA

Published Date

  • October 24, 2018

Published In

PubMed ID

  • 30358801

Electronic International Standard Serial Number (EISSN)

  • 1476-6256

Digital Object Identifier (DOI)

  • 10.1093/aje/kwy210

Language

  • eng

Conference Location

  • United States