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Monday, Oct 12
Joe Grengs, Policy & Planning for Social Equity in Transportation

The sensitivity of linear regression coefficients' confidence limits to the omission of a confounder

Publication Abstract

Hosman, Carrie A., Ben Hansen, and Paul W. Holland. 2010. "The sensitivity of linear regression coefficients' confidence limits to the omission of a confounder." Annals of Applied Statistics, 4(2): 849-870.

Omitted variable bias can affect treatment effect estimates obtained from observational data due to the lack of random assignment to treatment groups. Sensitivity analyses adjust these estimates to quantify the impact of potential omitted variables. This paper presents methods of sensitivity analysis to adjust interval estimates of treatment effect both the point estimate and standard error obtained using multiple linear regression. Central to our approach is what we term benchmarking, the use of data to establish reference points for speculation about omitted confounders. The method adapts to treatment effects that may differ by subgroup, to scenarios involving omission of multiple variables, and to combinations of covariance adjustment with propensity score stratification. We illustrate it using data from an influential study of health outcomes of patients admitted to critical care.

DOI:10.1214/09-AOAS315 (Full Text)

Country of focus: United States of America.

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