It’s time to just say NO! More thoughts on the NY State Tchr Eval System
This post is a follow up on two recent previous posts in which I first criticized consultants to the State of New York for finding substantial patterns of bias in their estimates of principal (correction: School Aggregate) and teacher (correction: Classroom aggregate) median growth percentile scores but still declaring those scores to be fair and accurate, and next criticized the Chancellor of the Board of Regents for her editorial attempting to strong-arm NYC to move forward on an evaluation system adopting those flawed metrics – and declaring the metrics to be “objective” (implying both fair and accurate).
Let’s review. First, the AIR report on the median growth percentiles found, among other biases:
Let’s review. First, the AIR report on the median growth percentiles found, among other biases:
Despite the model conditioning on prior year test scores, schools and teachers with students who