We found negligible differences in teacher quality between programs, amounting to no more than 3 percent of the average test - score gap between students from low - income families and their more affluent peers. (educationnext.org)
This data set permitted analysis of the question of differences in teacher quality in the determination of student outcomes in 2005. (performancematters.com)
These within - school differences likely understate the overall import of teacher effectiveness because, as recent evidence suggests, there are also differences in teacher quality across schools. (educationnext.org)