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ECLS |
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For a book that cautions us to look with a gimlet eye on expert opinion, Freakonomics is surprisingly light on documentation, and we aren't told how Levitt and Dubner analyzed the ECLS data to come to the conclusions they did. Throughout my analysis of the test-score data, I accounted for differences in previous student achievement, according to ECLS results, by adjusting for each student's achievement at the end of kindergarten. |
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