Overlapping Eligibility and Enrollment: Human Services and Health Programs Under the Affordable Care Act. Appendix III. Microsimulation Methodology

12/23/2013

This appendix describes the microsimulation methodology used to estimate health and human services eligibility and receipt. The tabulations for this report are drawn from information from two large microsimulation models, the Transfer Income Model, Version 3 (TRIM3), which is developed and maintained by the Urban Institute under primary funding from ASPE, and the Health Insurance Policy Simulation Model (HIPSM), also developed and maintained by the Urban Institute with funding from multiple sources, including ASPE, the Robert Wood Johnson Foundation, and the Kaiser Commission on Medicaid and the Uninsured.

HIPSM was used to estimate whether or not individuals were offered affordable employer-sponsored insurance, and then this information was imported into TRIM and combined with TRIM estimates of Modified Adjusted Gross Income (MAGI) to determine whether individuals qualify for HIM subsidies. Medicaid eligibility was estimated in TRIM using program rules simulated for 2014 (e.g., MAGI less than 138 percent of poverty or otherwise eligible). In addition, TRIM was used to estimate human services program eligibility and receipt. The following information provides a more detailed description of the methodologies used by each model.

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