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Eric A, Hanushek ; Laura M, Talpey ; Paul E, Peterson ; Eric, Hanushek ; Ludger, Woessmann. (2020) Long-Run Trends in the U.S. SES-Achievement Gap.
In: CESifo Working Paper Series. RePEc:ces:ceswps:_8111.

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According to U.S. Department of Health and Human Services (2018), the study recruited ten hospitals willing to participate as recruiting grounds for mothers willing and available to participate in a multi-year study. The sample description explicitly says its “data are not representative in the statistical sense, and therefore inference to the nation as a whole is not possible. Comparisons to other databases, national or otherwise, should be made with extreme caution.”45 The website for SECCYD identifies use of the Woodcock-Johnson Tests, which are designed to be IQ tests. It is not clear how these might translate into the reading or math achievement tests found in the other surveys. In any event, the survey does not meet the criterion of being nationally representative.

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