Structural equation models for evaluating dynamic concepts within longitudinal twin analyses.
A great deal of prior research using structural equation models has focused on longitudinal analyses and biometric analyses. Some of this research has even considered the simultaneous analysis of both kinds of analytic problems. The key benefits of these kinds of analyses come from the estimation of novel parameters, such as the heritability of changes. This paper discusses some recent extensions of longitudinal multivariate models that can be informative within biometric designs. In the methods section we review a previous latent growth structural equation analysis of the New York Twin (NYT) longitudinal data (from McArdle et al., 1998). In the models section we recast this growth model in terms of latent difference scores, add several new dynamic components, including coupling parameters, and consider biometric components and examine model stability. In the results section we present new univariate and bivariate dynamic estimates and tests of various dynamic hypotheses for the NYT data, and we consider a few ways to interpret the age-related biometric components of these models. In the discussion we consider our limitations and present suggestions for future dynamic-genetic research.
Department of Psychology, University of Virginia, Charlottesville, VA, USA. jjm@virginia.edu
John J
JJ
McArdle
Fumiaki
F
Hamagami
D006801:Humans; D007361:Intelligence Tests; D008137:Longitudinal Studies; D008962:Models, Theoretical; D018433:Twin Studies as Topic