How many students repeat a grade each year? How do retention rates vary across states and over time? Despite extensive research on the predictors and consequences of grade retention, there is no systematic way to quantify state-level retention rates; even national estimates rely on imperfect proxy measures. We present a conceptually simple…

Many have claimed that teachers' verbal ability is among the most important predictors of school outcomes. Teachers' verbal ability has been thought to predict student achievement ever since the relationship was found in the classic "Equality of Educational Opportunity" (EEO) study by Coleman et al. By way of meta-analysis the authors examine the…