The LA Times published a database of these value-added results two years ago, for teachers in the LA USD. The LA USD contains a mix of good teachers and time-servers, with the time-servers well-protected by the teachers' union's last-hired/first-fired policy. Teacher performance is not allowed to be a factor in layoffs.
These value-added statistics, which on a per-teacher basis must be incredibly noisy (they measure a difference, the "value added", of two already-noisy performance numbers) resulted in the suicide of a low-ranked teacher:
These value-added statistics, which on a per-teacher basis must be incredibly noisy (they measure a difference, the "value added", of two already-noisy performance numbers) resulted in the suicide of a low-ranked teacher:
http://www.msnbc.msn.com/id/39404037/ns/us_news-life/t/la-te...
I've been surprised to hear the credence placed in these statistics when I listen to presentations by principals and superintendents.