Multiple Imputations for LInear Regression Models

David Brownstone

University of California Transportation Center, Working Papers from University of California Transportation Center

Abstract: Rubin (1987) has proposed multiple imputations as a general method for estimation in the presence of missing data. Rubin’s results only strictly apply to Bayesian models, but Schenker and Welsh (1988) directly prove the consistency multiple imputations inference~ when there are missing values of the dependent variable in linear regression models. This paper extends and modifies Schenker and Welsh’s theorems to give conditions where multiple imputations yield consistent inferences for both ignorable and nonignorable missing data in exogenous variables. One key condition is that the imputed values must have the same conditional first and second moments as the true values. Monte Carlo studies show that the multiple imputation covariance estimates are accurate for realistic sample sizes. They also support the applications of multiple imputations in Brownstone and VaUetta (1991), where the multiple imputations estimates substantially changed the qualitative conclusions implied by the model.

Keywords: Architecture (search for similar items in EconPapers)
Date: 1991-11-01
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Citations: View citations in EconPapers (6)

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Working Paper: Multiple Imputations for Linear Regression Models (1991)
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