California is experiencing one of its most severe teacher shortages in two decades. Budget cuts and layoffs resulting from the recession contributed to a steep decline in the number of teachers in California, falling from a high of 310,362 teachers in the 2007-08 school year to 283,836 four years later. Recent efforts, including Proposition 30 and…

California, like many states, is experiencing significant challenges with teacher staffing. Numerous headlines over the last few years highlight the difficulties that the state faces in developing, recruiting, and, ultimately, hiring enough teachers (Blume, 2016; Apodaca, 2017; Calefati, 2017; Carver-Thomas & Darling-Hammond, 2017; Times…

Policymakers aiming to close the well-documented achievement gap between advantaged and disadvantaged students have increasingly turned their attention to issues of teacher quality. A number of studies have demonstrated that teachers are inequitably distributed across student subgroups by input measures like experience and qualifications, as well…

In this paper, the author discusses the role of methodology in assessing the effects of teacher qualifications on teacher effectiveness (also commonly referred to as the "quality of teaching"). The author focuses on some of the statistical problems that can arise in a non-experimental setting and the ways in which statisticians attempt…

Most studies that have fueled alarm over the attrition and mobility rates of high-quality teachers have relied on proxy indicators of teacher quality, which recent research finds to be only weakly correlated with value-added measures of teachers' performance. We examine attrition and mobility of teachers using teacher value-added measures for…