Journal
PSYCHOLOGY AND AGING
Volume 26, Issue 1, Pages 34-47Publisher
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/a0020525
Keywords
cross-sectional data; longitudinal data; variance partitioning; correlated change; longitudinal mediator
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In cross-sectional age variance extraction (CAVE), age, the indicator of a hypothesized developmental mechanism, and a developmental outcome are specified as independent, mediator, and target variables, respectively, to test hypotheses about behavioral development. We show that: (a) longitudinal change in a mediator variable accounting for substantial cross-sectional age-related variance in the target variable need not correlate with the target variable's longitudinal change; and, conversely, (b) longitudinal change in a mediator not sharing cross-sectional age-related variance with the target variable may nevertheless con-elate highly with that variable's longitudinal change. We discourage use of CAVE for testing multivariate hypotheses about behavioral development.
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