A few comments on the Gates/Kane value-added study
A few comments on the Gates/Kane Value-added study
(My apologies in advance for an excessively technical, research geeky post, but I felt it necessary in this case)
Take home points
1) As I read it, the new Gates/Kane value-added findings are NOT by any stretch of the imagination an endorsement of using value-added measures of teacher effectiveness for rating individual teachers as effective or not or for making high-stakes employment decisions. In this regard, the Gates/Kane findings are consistent with previous findings regarding stability, precision and accuracy of rating individual teachers.
2) Even in the best of cases, measures used in value-added added models remain insufficiently crude to account