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. 2005 Sep;20(3):412-22.
doi: 10.1037/0882-7974.20.3.412.

Multivariate modeling of age and retest in longitudinal studies of cognitive abilities

Emilio Ferrer  1 , Timothy A Salthouse, John J McArdle, Walter F Stewart, Brian S Schwartz
Affiliations

Multivariate modeling of age and retest in longitudinal studies of cognitive abilities

Emilio Ferrer et al. Psychol Aging. 2005 Sep.

Abstract

Longitudinal multivariate mixed models were used to examine the correlates of change between memory and processing speed and the contribution of age and retest to such change correlates. Various age- and occasion-mixed models were fitted to 2 longitudinal data sets of adult individuals (N>1,200). For both data sets, the results indicated that the correlation between the age slopes of memory and processing speed decreased when retest effects were included in the model. If retest effects existed in the data but were not modeled, the correlation between the age slopes was positively biased. The authors suggest that although the changes in memory and processing speed may be correlated over time, age alone does not capture such a covariation.

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Figures

Figure 1
Figure 1
Individual longitudinal data for each data set. All figures represent a random 30% of all the cases. ALEND = Age, Lead Exposure, and Neurobehavioral Decline Study; NGCS = National Growth and Change Study.
Figure 2
Figure 2
Individual longitudinal data with the same variables superimposed across data sets. All figures represent a random 30% of all the cases. ALEND = Age, Lead Exposure, and Neurobehavioral Decline Study; NGCS = National Growth and Change Study.
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MeSH terms