http://fivethirtyeight.com/features/the-science-of-grading-teachers-gets-high-marks/ is a discussion about teacher evaluation and attempts to eliminate confounding factors from the evaluations.
Andrew Flowers at fivethirtyeight.com wrote:
At the center of this debate are evaluation models that try to isolate the educational value added by individual teachers, as measured by their students’ standardized-test scores relative to what one would expect given those students’ prior scores. The hard part, as Friedman says, is to “make sure that when you rate a teacher, that you actually rate what the teacher has done, and not whether they had a bunch of very poor or very rich students.”
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