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An Index of Tracking for Longitudinal Data

M. A. Foulkes and C. E. Davis
Biometrics
Vol. 37, No. 3 (Sep., 1981), pp. 439-446
DOI: 10.2307/2530557
Stable URL: http://www.jstor.org/stable/2530557
Page Count: 8
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An Index of Tracking for Longitudinal Data
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Abstract

Longitudinal studies provide the opportunity to relate chronic disease risk factors in children to the same risk factors in adults. The epidemiologic concept of tracking allows the quantification of that relationship. Tracking of a risk factor is defined as the maintenance of relative rank over a given time span. A U statistic is defined, which is based on a set of individual growth curves and which estimates the degree of tracking observed. The properties of this estimator are discussed, and applications presented.

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