Interpreting the magnitudes of correlation coefficients.

Hemphill, James F.

doi:10.1037/0003-066X.58.1.78

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Interpreting the magnitudes of correlation coefficients.

Author(s): James F. Hemphill

Publication date Created: 2003

Publication date (Print): 2003

Journal: American Psychologist

Publisher: American Psychological Association (APA)

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Statistical methods in psychology journals: Guidelines and explanations.

Leland Wilkinson (1999)

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The efficacy of psychological, educational, and behavioral treatment. Confirmation from meta-analysis.

M W Lipsey, D B Wilson (1993)

Conventional reviews of research on the efficacy of psychological, educational, and behavioral treatments often find considerable variation in outcome among studies and, as a consequence, fail to reach firm conclusions about the overall effectiveness of the interventions in question. In contrast meta-analytic reviews show a strong, dramatic pattern of positive overall effects that cannot readily be explained as artifacts of meta-analytic technique or generalized placebo effects. Moreover, the effects are not so small that they can be dismissed as lacking practical or clinical significance. Although meta-analysis has limitations, there are good reasons to believe that its results are more credible than those of conventional reviews and to conclude that well-developed psychological, educational, and behavioral treatment is generally efficacious.