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Hertzog, Christopher; Nesselroade, John R. – Child Development, 1987
Challenges the typical treatment of causal effects in longitudinal data, arguing that models should be conceptualized and tested in ways that directly reflect prior assumptions as to the trait- or state-like nature of the variables. Examples demonstrate that meaningful longitudinal studies of state variables can be conducted without assuming their…
Descriptors: Individual Development, Longitudinal Studies, Models, Research Methodology