States have invested heavily in improving early childhood education in hopes of improving student reading and math skills before they enter kindergarten. However, there is limited national data from later than 2010 on children's skills in these areas at kindergarten entry, so it is difficult for educators and policy makers to ascertain whether…

Important educational policy decisions, like whether to shorten or extend the school year, often require accurate estimates of how much students learn during the year. Yet, related research relies on a mostly untested assumption: that growth in achievement is linear throughout the entire school year. We examine this assumption using a dataset…

Growing evidence suggests that contrary to popular belief, schools mostly do not generate achievement gaps in cognitive skills but, rather, reflect the inequalities that already exist. In the case of socioeconomic status, exposure to school often reduces gaps. Surprisingly little is known, however, about whether this pattern extends to gender gaps…