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1. The Placebo Control Group: An Analysis of Its Effectiveness in Educational Research.

Author

Adair, John G.

Abstract

A review and meta-analysis were made of placebo control groups in educational experiments. In all, 125 studies were clustered into procedures that included (1) explicit manipulation of attentional elements; (2) explicit description of the placebo activity plus implied reference to attention; and (3) exclusive reference to the activity. (SLD)

Published
1990

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