The General Educational Development (GED) credential has become the primary 'second chance' route to high school certification for school dropouts in the United States. Despite the widespread use of the GED, however, bias due to self-selection has limited our knowledge about the effects of the...

We report results from our long-standing research partnership with the Massachusetts Department of Elementary and Secondary Education. We make two primary contributions. First, we illustrate the wide range of informative analyses that can be conducted using a state longitudinal data system and...