About a year or so ago, the NY Times ran a big, splashy article about a new study that purported to quantify the value added by a great teacher over the earning lifetime of his/her class. Well, just like the Texas Miracle, the Atlanta Debacle, and the Rhee Makeover, it seems maybe it wasn't quite such a good study in the first place. Bruce Baker has been looking at it, and concludes the numbers were overstated, to say the least.
http://dianeravitch.net/2013/06/13/bruce-baker-another-look-at-the-much-hyped-chetty-rockoff-freidman-study/comment-page-1/#comment-187587
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