terça-feira, 28 de fevereiro de 2012

continua a saga... 'humilhação' pública dos professores... pelos 'states'...! as opinões são [?] 'unânimes'...

"In its coverage, the august New York Times sent a mixed message. Its first headline said "Teacher Quality Widely Diffused, Ratings Indicate," which implied that the ratings actually measured teacher quality and meant something real and important. And indeed, the first three paragraphs stated that every corner of the city, from the poorest to the most affluent districts, had teachers who were the most and least successful.

But the fourth paragraph of the Times story revealed the statistical inadequacy of the measures: "... the margin of error is so wide that the average confidence interval around each rating spanned 35 percentiles in math and 53 in English, the city said. Some teachers were judged on as few as 10 students." With such a large margin of error, it's hard to know how anyone could take these ratings seriously. The precise numbers attached to each teacher's name are nothing more than junk science."


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