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Statistics and Measurement

We are at the forefront of efforts to improve disability data and statistics. Our efforts in this area include conducting and developing question modules for the new National Beneficiary Survey, documenting the federal surveys that collect information about people with disabilities, collecting survey data for the 2012 National Longitudinal Transition Study (NLTS-2012), a five-year study focused on youth ages 13 to 23, their educational experiences, and their transitions to adulthood, and developing and maintaining a longitudinal analytic research file on working-age DI and SSI beneficiaries, using the Social Security Administration's Disability Analysis File (DAF).

Our Featured Work

Disability Statistics and Measurement Rehabilitation Research and Training Center (StatsRRTC)

The Rehabilitation Research and Training Center on Disability Statistics and Demographics aims to narrow and bridge the divide between producers and end users of disability statistics, supporting better data collection, decision-making, programs, and lives for people with disabilities.

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National Beneficiary Survey

This survey collects data on the employment-related activities of working-age SSDI and SSI beneficiaries. Mathematica has been conducting the NBS since its inception in 2004 and we will be implementing additional survey rounds in 2015, 2017, and 2019.

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John Czajka

Senior Fellow

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.

Featured Publications
- Declining Response Rates in Federal Surveys: Trends and Implications (Background Paper)
- Redesign of the Income Questions in the Current Population Survey Annual Social and Economic Supplement: Further Analysis of the 2014 Split-Sample Test
Topics
- Statistics and Measurements
- Medicaid and CHIP
- Statistics and Measurements
- Nutrition Assistance Programs
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Our Featured Publications

Declining Employment Among a Growing Group of Work-Oriented Beneficiaries, 2005-2015

Compendium of Disability Data Collection Methods

Federal and State Expenditures for Working-Age People With Disabilities in Fiscal Year 2014

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Statistics and Measurement