GROWTH-RATE RELIABILITY IN LONGITUDINAL MEASUREMENT

Authors
WOODRUFF D HOUSTON M
Citation
D. Woodruff et M. Houston, GROWTH-RATE RELIABILITY IN LONGITUDINAL MEASUREMENT, Educational and psychological measurement, 54(4), 1994, pp. 897-902
Citations number
6
Categorie Soggetti
Psychology, Educational","Psychologym Experimental","Mathematical, Methods, Social Sciences
Journal title
Educational and psychological measurement → ACNP
ISSN journal
00131644
Volume
54
Issue
4
Year of publication
1994
Pages
897 - 902
Database
ISI
SICI code
0013-1644(1994)54:4<897:GRILM>2.0.ZU;2-B
Abstract
The reliability of the growth rate parameter estimator first presented by J. B. Willet for a linear growth model is derived and critically e xamined. The effects on the reliability of the growth rate of the inte rvals between the longitudinal measurements and the covariances betwee n the longitudinal measurements are distinguished. It is demonstrated that, mathematically, the latter and not the former functionally deter mines the reliability of the growth rate, but it is also recognized th at, practically, the time intervals may affect the covariances.