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Rater calibration when observational assessment occurs at large scale: Degree of calibration and characteristics of raters associated with calibration An examination of the accuracy of raters trained by the Office of Head Start (OHS) in 2008-2009 on the Classroom Assessment Scoring System (CLASS), based on data from 2,093 raters, and additional analyses of characteristics that predict their accuracy, based on data for a subsample of 704 of the raters |
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