Dr. Sung-Jae Lee is an Assistant Professor-in-Residence in the Department of Psychiatry and Biobehavioral Sciences at UCLA David Geffen School of Medicine and Core Scientist for CHIPTS Methods Core. Dr. Lee is an epidemiologist whose research has included adaptation of family-based interventions for HIV-affected families in Thailand, examination of HIV vaccine acceptability, assessment of HIV-testing preferences, and assessment of pre-exposure prophylaxis acceptability. He has conducted HIV...

Dr. Scott Comulada is a biostatistician who has served on the UCLA School of Medicine faculty since he joined the Department of Psychiatry and Biobehavioral Sciences as an Assistant Professor-in-Residence in 2010. He has been a Statistician and then a Research Scientist for the Semel Institute Center for Community since 1999. Dr. Comulada was an Associate Director of the Methods Core for the Center for HIV Prevention, Identification, and Treatment Services (CHIPTS) from 2009 to 2010 and is...

Presented on 4/10/12. Self-management of risk behaviors is a cornerstone of future population health. Using mobile phones for routine self-monitoring is a cost-efficient strategy for self-management. Despite benefits, new challenges are also introduced. Costs, logistics, and appropriateness of mobile phones for the intended population need to be considered. Daily reports that are common to mobile data collection versus retrospective self-reports that are common to traditional studies offer...

presented on: 4/10/12. Self-management of risk behaviors is a cornerstone of future population health. Using mobile phones for routine self-monitoring is a cost-efficient strategy for self-management. Despite benefits, new challenges are also introduced. Costs, logistics, and appropriateness of mobile phones for the intended population need to be considered. Daily reports that are common to mobile data collection versus retrospective self-reports that are common to traditional studies...

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...