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‘Well I’ll be VAMned!’ Why using student test scores to evaluate teachers is a sham

7/8/2015

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By Valerie Strauss July 8  
​
​If by now you don’t know what VAM is, you should. It’s shorthand for value-added modeling (or value-added measurement), developed by economists as a way to determine how much “value” a teacher brings to a student’s standardized test score. These formulas are said by supporters to be able to factor out things such as a student’s intelligence, whether the student is hungry, sick or is subject to violence at home, or any other factor that could affect performance on a test beyond the teacher’s input. But assessment experts say that such formulas can’t really do that accurately and reliably. In fact, the American Statistical Association issued a report in 2014 on VAM and said: “VAMs are generally based on standardized test scores and do not directly measure potential teacher contributions toward other student outcomes.”  click here for full article: Via The Washington Post


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High-achieving teacher sues state over evaluation labeling her ‘ineffective’

10/31/2014

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By Valerie Strauss October 31, 2014 
​Sheri G. Lederman has been teaching for 17 years as a fourth-grade teacher  in New York’s Great Neck Public School district. Her students consistently  outperform state averages on math and English standardized tests, and  Thomas Dolan, the superintendent of Great Neck schools, signed an affidavit saying “her record is flawless” and that “she is highly regarded as an educator.” for full article: Via The Washington Post


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