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Good discussion of “value-added” teacher evaluation issues from NYU researcher Sean Corcoran, author of, “Can Teachers be Evaluated by Their Students’ Test Scores? Should They Be?” (PDF available for download at the website)

Precision and stability… the value added measures are really estimates, they’re statistical estimates of teachers’ effectiveness and there’s a big margin of error around these to the extent that we have uncertainty about whether or not students’ achievement is due to teacher or some other outside influence and there’s going to be a margin of error and…. the margin of error tends to be very large. Go to the original…

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