A new system for rating New York state teachers and principals based on students' test scores has many flaws, writes Sean C. Feeney, principal of The Wheately School, in this blog post. For example, Feeney, who leads a campus serving students in grades 8-12, writes that he received widely varying ratings based on the test scores of eighth-graders, when compared with those of students in grades 9-12. "The notion that one can look at a single grade and extrapolate a rating for an educator is nonsensical and bad statistical practice," he writes.

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