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Are value-added scores for secondary-school teachers flawed?
Value-added scores used to assess middle- and high-school teachers' effectiveness could be unreliable, according to a pair of studies. Researchers found that such measures do not account for more- or less-rigorous tracks taken by secondary-school students. "I think it suggests that we're making even more errors than we need to -- and probably pretty large errors -- when we're applying value-added to the middle-school level," said Douglas N. Harris, an associate professor of economics at Tulane University in New Orleans.

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