Big Study Links Good Teachers to Lasting Gain - NYTimes.com

http://www.nytimes.com/2012/01/06/education/big-study-links-good-teachers-to-lasting-gain.html

The "Chetty" study used some really large data sets to try to calculate the long-term benefits of having good teachers. Yes, having good teachers is a good thing, but it wouldn't be wise to get hung up on the specific gains this study estimates.