Opinion: L.A. Times' story used flawed methods to evaluate teachers

08/20/2010 | LAObserved.com (Los Angeles)

The data used by the Los Angeles Times to evaluate teacher effectiveness are prone to errors and could hurt teachers' careers, according to this analysis by blogger Bill Boyarsky. He identifies the flaws of using the value-added scores to evaluate teachers, such as the lack of data before second grade. He also compares the Times data to a political poll and says the probability of error is high with such a large amount of data.

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LAObserved.com (Los Angeles)

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