We use data from the Stanford Education Data Archive to describe district-level trends in average academic achievement between 2009 and 2019. Though on average school districts’ test scores improved very modestly (by about 0.001 SDs/year), there is significant variation among districts. Moreover, we find that average test score disparities between non-poor and poor students and between White and Black students are growing; those between White and Hispanic students are shrinking. We find no evidence of achievement-equity synergies or tradeoffs: Improvements in overall achievement are uncorrelated with trends in achievement disparities. Finally, we find that the strongest predictors of achievement disparity trends are the levels and trends in within-district racial and socioeconomic segregation and changes in differential access to certified teachers.
