VAM gets Slammed: Teacher Evaluation Not A Game of Chance - Living in Dialogue - Education Week Teacher: "Blogger and math teacher Gary Rubenstein has done an amazing job analyzing the data that has been made public in New York. Here are some of his findings.
In his first attempt, Gary worked with a basic assumption. If VAM scores are at all accurate, there ought to be a significant correlation between a teacher's score one year compared to the next. In other words, good teachers should have somewhat consistently higher scores, and poor teachers ought to remain poor. He created a scatter plot that put the ratings from 2009 on one axis, and the ratings from 2010 on the other axis. What should we expect here? If there is a correlation, we should see some sort of upward sloping line. Here is what Gary got:"
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