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John L. Czajka
Senior Fellow
John Czajka is a senior fellow at Mathematica in Washington, DC.
Czajka, who joined Mathematica in 1978 as a research sociologist, is well known for his technical contributions to the statistical field. His work has focused on development of administrative data files, small area estimation, policy analysis, and the evaluation of estimates obtained from survey data. He has directed many studies of health insurance coverage, including analyses of the dynamics of coverage over time and the impact of the Children’s Health Insurance Program on trends in children’s coverage.
Czajka’s work for the Internal Revenue Service has improved the practice of statistics at the Statistics of Income Division, one of the federal government’s major statistical agencies. His research for clients such as the U.S. Department of Health and Human Services, the Centers for Medicare & Medicaid Services, and the Social Security Administration has been widely cited.
Czajka is a fellow of the American Statistical Association and a past president of the Washington Statistical Society. He has served on many National Research Council panels, including the Panel on the Census Bureau’s Dynamics of Economic Well-Being System, Panel on Research and Development Priorities for the U.S. Census Bureau’s State and Local Government Statistics Programs, Panel on Data and Methods for Measuring the Effects of Changes in Social Welfare Programs, and Panel on Alternative Census Methodologies. He has a Ph.D. in sociology from the University of Michigan.
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- Areas of Expertise
- Key Projects
- Professional Activities
- Publications
- Development of administrative data files
- Small area estimation and policy analysis
- Evaluation of estimates obtained from survey data
- Transition Events in Health Insurance Coverage: Survey of Income and Program Participation Tabulations of the Uninsured
- Assessing the Quality of Income Data Across Surveys
- Study of Survey Sample Loss and Data Matching for Social Security Beneficiaries
- Fellow, American Statistical Association
- Past president, Washington Statistical Society
- "Income Data for Policy Analysis: A Comparative Assessment of Eight Surveys" (December 2008)
- "Sample Loss and Survey Bias in Estimates of Social Security Beneficiaries: A Tale of Two Surveys" (February 2008)
- "Dynamics in Medicaid and SCHIP Eligibility Among Children in SCHIP's Early Years: Implications for Reauthorization." Health Affairs (September/October 2007)