The present article considers a fundamental question in evaluation research: "By how much do program effects vary across sites?" The article first presents a theoretical model of cross-site impact variation and a related estimation model with a random treatment coefficient and fixed site-specific intercepts. This approach eliminates…

In school districts across the nation, diverse student groups have been experiencing significant gains in reading performance after using READ 180. This compendium of READ 180 research contains 40 studies. The studies take place in a variety of settings in school districts across the country from 1999 to 2012. Summarized are correlational and…

This study investigated how three factors impacted performance on cost-volume-profit homework problems: language, formula use, and instruction. Students enrolled in Introduction to Financial Accounting (the first principles of accounting course) and Managerial Accounting (the second principles of accounting course) from eight different US colleges…

This study examines the impact of affirmative action bans in six states (California, Washington, Florida, Texas, Michigan, and Nebraska) on the matriculation rates of historically underrepresented students of color in public medical schools in these states. Findings show that affirmative action bans have led to about a 17% decline (from 18.5% to…

Schools across the United States are facing budgetary pressures on a scale not seen in generations. Times of fiscal exigency force policymakers and education practitioners to pay more attention to the return on various categories of public investment in education. The sizes of the classes in which students are educated are often a focus of these…

City Year is a learning organization committed to the rigorous evaluation of its "Whole School Whole Child" model, which trains and deploys teams of AmeriCorps members to low-performing, urban schools to empower more students to reach their full potential. A third-party study by Policy Studies Associates (PSA) examined the impact of…

In school districts across the nation, diverse student groups, including English Learners and students with disabilities, have been experiencing significant gains in reading performance after using READ 180. This compendium of READ 180 research contains results of 40 studies conducted in a variety of settings, in school districts across the…

Prior research has established the potential for achievement gains from attending smaller classes. However, large statewide class-size reduction (CSR) policies have not been found to consistently realize such gains. A leading explanation for the disappointing performance of CSR policies is that schools are forced to hire additional teachers of…