This New York Times article mentions that with one year of data that 35% of teachers are misranked and with three years of data that 25% of teachers are misranked. Therefore, I would say that if we lean heavily on the data that we will be incorrectly “dealing with” 25% of teachers — ticking off good ones and making them leave and rewarding bad ones. We can do better than this administrators and school boards. Come on!
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