Abstract
The traditional procedure for obtaining judged rat ings, to ascertain if treatment-related change has oc curred, involves the randomization of the materials to be rated. An alternative approach (linked judgments) is investigated as a potential solution to certain instru mentation-related threats to statistical conclusion valid ity of the incumbent rating procedure. Data from a weight reduction study are presented which suggest that linked raters' judgments provide both a more powerful and a more valid index of treatment effec tiveness than the traditional procedure.
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