The New York City schools have released value-added estimates for individual teaches over five years.
This should make for some lively discussion over the next few days.
For the technically inclined, the NYT reporters' mangling of basic statistics about 2/3 of the way through the article will provide some entertainment. In particular, the NYT reports seem quite innocent regarding the types of variation that will be picked up, or not, in the estimated standard errors.
The Brits report school-level, rather than teacher-level, performance measures (also based on "value-added" models), which reduces the micro-numerosity (i.e. small n) problem a bit. My sense is that principals in the UK have a lot more control over their schools than do principals in NYC, which also argues for school-level rather than individual reporting.
Related paper by yours truly here.
Hat tip: Sara Goldrick-Rab
It's really quite easy.
1 year ago