Using data from Mathematica's experimental evaluation of charter schools, this methodological study examines the validity of four different comparison group approaches to test whether these designs can replicate findings from a well-implemented random assignment study.

This paper looks at findings from the first national randomized study of the impacts of charter schools on student achievement.

The first-year findings reveal that while the 21st Century Community Learning Centers changed where and with whom students spent some of their after-school time and increased parental involvement, they had limited influence on academic performance, no influence on feelings of safety or on the...

This PowerPoint presentation was made at the American Educational Research Association Annual Meeting.

This report provides findings from the largest charter school study of its kind to date to use an experimental design. On average, charter middle schools that hold lotteries are neither more nor less successful than traditional public schools in improving student achievement, behavior, and...

This article draws on data and experiences observing and analyzing school lotteries from the National Evaluation of Charter School Impacts to describe challenges associated with lottery-based research. It presents evidence on the prevalence of oversubscribed charter middle schools and compares...