The Increasing Academic Ability Of New York Teachers
For many years now, a common talking point in education circles has been that U.S. public school teachers are disproportionately drawn from the “bottom third” of college graduates, and that we have to “attract better candidates” in order to improve the distribution of teacher quality. We discussed the basis for this “bottom third” claim in this post, and I will not repeat the points here, except to summarize that “bottom third” teachers (based on SAT/ACT scores) were indeed somewhat overrepresented nationally, although the magnitudes of such differences vary by cohort and other characteristics.
A very recent article in the journal Educational Researcher addresses this issue head-on (a full working version of the article is available here). It is written by Hamilton Lankford, Susanna Loeb, Andrew McEachin, Luke Miller and James Wyckoff. The authors analyze SAT scores of New York State teachers over a 25 year period (between 1985 and 2009). Their main finding is that these SAT scores, after a long term decline, improved between 2000 and 2009 among all certified teachers, with the increases being especially large among incoming (new) teachers, and among teachers in high-poverty schools. For example, the proportion of incoming New York teachers whose SAT scores were in the top third has increased over 10 percentage points, while the proportion with scores in the bottom third has decreased by a similar amount (these figures define “top third” and “bottom third” in terms of New York State public school students who took the SAT between 1979 and 2008).
This is an important study that bears heavily on the current debate over improving the teacher labor supply, and there are few important points about it worth discussing briefly.