DOI

10.17077/etd.3aofo5uh

Document Type

Dissertation

Date of Degree

Spring 2018

Access Restrictions

Access restricted until 07/03/2020

Degree Name

PhD (Doctor of Philosophy)

Degree In

Biostatistics

First Advisor

Jones, Michael

Second Advisor

Zamba, Gideon

First Committee Member

Jones, Michael

Second Committee Member

Zamba, Gideon

Third Committee Member

Menda, Yussuf

Fourth Committee Member

Foster, Eric

Fifth Committee Member

Brown, Grant

Abstract

Imputation is one well recognized method for handling missing data. Multiple imputation provides a framework for imputing missing data that incorporate uncertainty about the imputations at the analysis stage. An important factor to consider when performing multiple imputation is the imputation model. In particular, a careful choice of the covariates to include in the model is crucial. The current recommendation by several authors in the literature (Van Buren, 2012; Moons et al., 2006, Little and Rubin, 2002) is to include all variables that will appear in the analytical model including the outcome as covariates in the imputation model. When the goal of the analysis is to explore the relationship between the outcome and the variable with missing data (the target variable), this recommendation seems questionable. Should we make use of the outcome to fill-in the target variable missing observations and then use these filled-in observations along with the observed data on the target variable to explore the relationship of the target variable with the outcome? We believe that this approach is circular. Instead, we have designed multiple imputation approaches rooted in machines learning techniques that avoid the use of the outcome at the imputation stage and maintain reasonable inferential properties. We also compare our approaches performances to currently available methods.

Keywords

clustering, imputation model, multiple imputation, penalized splines

Pages

xiii, 277 pages

Bibliography

Includes bibliographical references (pages 275-277).

Copyright

Copyright © 2018 Monelle Tamegnon

Available for download on Friday, July 03, 2020

Included in

Biostatistics Commons

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