Work

Multivariate Modeling of Age and Retest in Longitudinal Studies of Cognitive Abilities.

Year: 2005

Type: article

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.

Source: Psychology and Aging

DOI: 10.1037/0882-7974.20.3.412

Authors: Emilio Ferrer, Timothy A. Salthouse, John J. McArdle, Walter F. Stewart, Brian S. Schwartz

Institutions: University of California, Davis, University of Virginia, Johns Hopkins University

Language: English

Topic: Cognitive Abilities and Testing

Subfield: Experimental and Cognitive Psychology

Field: Psychology

Domain: Social Sciences

Open Access status: green

Funder: National Institute on Aging

Award: Short-term cognitive change in adults from 18 to 80