CCH/HSRC Methods Seminar: Incomplete Data Analysis

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Date(s) - Mar 13, 2012
2:00 PM - 3:00 PM

UCLA Center for Community Health


CCH/HSRC Methods Seminar
UCLA-Semel Institute Center for Community Health
UCLA-Semel Institute Health Services Research Center

Incomplete Data Analysis

Presented by:

Juwon Song, Ph.D.

Professor, Department of Statistics, Korea University

Abstract: Survey data often include missing values due to nonresponse. Especially, sensitive questions such as questions about income or assets tend to show higher percentage of missing values. When missing values occur, complete-case analysis may lead to biased estimates of parameters. Korean Longitudinal Study of Aging(KLoSA) is a longitudinal study to evaluate aging trends in the Korean population and apply the results to the social welfare and labor policy.  KLoSA collected baseline data in 2006 and first follow-up data in 2008. We conducted multiple imputation based on hotdeck to handle missing values in KLoSA baseline and first follow-up data. In this study, we explain the imputation strategy adopted for filling in missing values of major outcome variables in KLoSA.


Biography: Dr. Juwon Song is an Associate Professor in the Department of Statistics at Korea University and Associate visiting professor in the Department of Biostatistics at UCLA since October 2011. Dr. Song has served as a Chair of the Department of Data Information Science in the Graduate School of Policy Studies and Director of the Institute of Statistics at Korea University. Dr. Song received her Ph.D. in Biostatistics from the UCLA Department of Biostatistics, School of Public Health, in 1999.  In the past, Dr. Song was a research faculty at the Department of Biostatistics and the Center for Community Health at UCLA and an assistant professor in the Department of Biostatistics at the University of Texas, M.D. Anderson Center.  Her research interests include analysis of incomplete data, longitudinal data analysis, and biostatistics.

For further information or to view slides of past seminars, please visit or contact Kate Desmond at

This seminar series is supported by the National Institute of Mental Health (P 30 MH-58107).

Download seminar presentation here: Methods Seminar Presentation 2012 (936)