One of the most vexing challenges facing developmental researchers today is the statistical modeling of two or more behaviors as they unfold jointly over time. Although quantitative methodologists have studied these issues for more than half a century, no widely agreed-upon principled strategy exists to empirically analyze codevelopmental…

Provides example of use of exploratory growth modeling to examine changes over time in functioning of 172 families who underwent treatment in Project Good Start prevention program. Addresses within-family and between-family research questions. Results highlight heterogeneity across families in direction and rate of family function change and its…

The results of six major projects are discussed including a comprehensive mathematical and statistical analysis of the problems caused by errors of measurement in linear models for assessing change. In a general matrix representation of the problem, several new analytic results are proved concerning the parameters which affect bias in…