On Report Cards for N.Y.C. Schools, Invisible Line Divides ‘A’ and ‘F’ - NYTimes.com:
And yet, what appears to be a substantial difference in two schools’ achievement scores can come down to just a few correct answers per child.
The 41 percent proficiency rate at P.S. 30 looks considerably better than the 29 percent at P.S. 179.
But there’s another way to look at the difference. Their averages would have been the same if each third grader at P.S. 179 got three more answers correct out of the 54 questions on the test; each fourth grader got three more correct out of 73; and each fifth grader two more out of 61.
“You start with a small difference on the test scores and then out of necessity use a very complex methodology,” said Raymond Domanico, director of education research for the budget office. “One result may be that it is compounding these small differences.”
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