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Separating Reliability and Stability in Test-Retest Correlation

David R. Heise
American Sociological Review
Vol. 34, No. 1 (Feb., 1969), pp. 93-101
Stable URL: http://www.jstor.org/stable/2092790
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Separating Reliability and Stability in Test-Retest Correlation
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Abstract

Formulas are developed for estimating the true reliability of a measure from data collected at three points in time. The procedure can be applied to a single question, and unlike traditional test-retest reliabilities, this measure is not reduced in value when changes occur during the testing interval. A related coefficient of stability also is introduced, and a procedure is presented for examining the credibility of required assumptions.

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