Journal
CANADIAN JOURNAL OF PSYCHIATRY-REVUE CANADIENNE DE PSYCHIATRIE
Volume 46, Issue 1, Pages 72-76Publisher
CANADIAN PSYCHIATRIC ASSOC
DOI: 10.1177/070674370104600111
Keywords
regression toward the mean; statistics; reliability; change scores
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This paper explores the phenomenon of regression toward the mean. '' The primary effect of this is to affect scores on retesting so that they are closer to the population mean. Thus, people who are selected for inc inclusion in a study because their scores on some measure are above (or below) some criterion have values on retesting that are less extreme. This may make it appear that the study participants have improved; this will occur even in the absence of an effective intervention. We explore the reasons for regression toward the mean and how it can be detected and discuss some methods that may minimize its effects.
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