Across the country and in urban areas in particular, many students change schools during the academic year. While much research documents the impact of changing schools on the academic achievement of mobile students themselves, less research explores whether new arrivals have negative spillovers on stable classmates. The lack of research on…

We examine the size and distribution of the gap in test scores across races within New York City public schools and the factors that explain these gaps. While gaps are partially explained by differences in student characteristics, such as poverty, differences in schools attended are also important. At the same time, substantial within-school gaps…

Immigration and migration to New York City (NYC) collectively create a dynamic population of students. In this brief the authors use a decade of detailed, longitudinal data on NYC's 1st-8th graders to explore both the "stock" of students enrolled and the "flow" of new entrants in each academic year. Together, these paint a…

Although the No Child Left Behind Act was intended to help "all students meet high academic standards," it is focused on subgroups of low-achieving students. The authors analyze the possible impact of the legislation's requirement for performance reporting by racial subgroup in light of the considerable racial segregation in U.S.…

State and federal accountability reforms are putting considerable pressure on schools to increase the achievement of historically low-performing groups of students and to close test score gaps. In this article, we exploit the differences among the large number of elementary schools in New York City to examine how much schools vary in the…