Wednesday, October 26, 2016

JPAM Featured Article: "Early Impacts of the Affordable Care Act on Health Insurance Coverage in Medicaid Expansion and Non-Expansion States"

As part of our ongoing effort to promote JPAM authors to the APPAM membership and the public policy world at large, we are asking JPAM authors to answer a few questions to promote their research article on the APPAM website.


What Works Best and When: Accounting for Multiple Sources of Pureselection Bias in Program Evaluations

July 24, 2014 09:00 AM

Most evaluations are still quasi-experimental and most recent quasi-experimental methodological research has focused on various types of propensity score matching to minimize conventional selection bias on observables. Although these methods create better-matched treatment and comparison groups on observables, the issue of selection on unobservables still looms large. Thus, in the absence of being able to run randomized controlled trials (RCTs) or natural experiments, it is important to understand how well different regression-based estimators perform in terms of minimizing pure selection bias, that is, selection on unobservables.

Authors Haeil Jung and Maureen Pirog examine the relative magnitudes of three sources of pure selection bias: heterogeneous response bias, time-invariant individual heterogeneity (fixed effects [FEs]), and intertemporal dependence (autoregressive process of order one [AR(1)]). Because the relative magnitude of each source of pure selection bias may vary in different policy contexts, it is important to understand how well different regression-based estimators handle each source of selection bias.

Read the full article in the Summer 2014 JPAM or at WileyOnline.


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