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Applied Psychological Measurement
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Stability Coefficients in Longitudinal Studies

Joseph Levin

Tel-Aviv University

Longitudinal studies of personality traits and intelligence have used an exponential function to relate the magnitudes of the correlations between occasions to the time interval. This exponential function is shown to be equivalent to a quasi- simplex model of a stationary process with con stant reliability. Two numerical illustrations are provided that compare the least-squares fit of the logarithm of the exponential function to an analy sis of the covariance structure.

Key Words: Index terms: change scores • covariance structure analysis, exponential function • LISREL • simplex • stability index.

Applied Psychological Measurement, Vol. 17, No. 1, 17-19 (1993)
DOI: 10.1177/014662169301700104
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