- Development of administrative data files
- Small area estimation and policy analysis
- Evaluation of estimates obtained from survey data
- Data Analytics
- Advanced Analytics
John Czajka 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, who joined Mathematica in 1978 as a research sociologist, 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.