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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 recent work has included two comparative studies of the measurement of income and poverty in federal surveys; analyses of the dynamics of Medicaid coverage based on Medicaid enrollment records; an assessment of the potential implications of using Modified Adjusted Gross Income to determine eligibility for Medicaid, as prescribed by the Affordable Care Act; evaluations of the application of statistical disclosure limitation methods to Internal Revenue Service data; and a study of survey underreporting of participation in the Supplemental Nutrition Assistance Program and other means-tested programs.
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
- "Medicaid Enrollment Gaps, 2005-2007." MAX Medicaid Policy Brief #6 (June 2012)
- "Movement of Children Between Medicaid and CHIP, 2005 to 2007" (January 2012)
- "Expanding Access to Medicaid Data for Research: Feasibility of a MAX Sample" (December 2010)