Intellectual ability among the elderly: Simultaneous cross-sectional and longitudinal comparisons
Made simultaneous cross-sectional and longitudinal comparisons of WAIS performances of 70 Ss. The comparisons were such that approximately 4 yrs separated the age groups both cross-sectionally and longitudinally. The groups were aged 60-63, 64-67, 68-71, and 72-75 yrs. The results indicate no significant age differences with the cross-sectional comparison but significant age differnces with the longitudinal comparisons. The latter differences, however, were small. It is concluded that when the age spans of cross-sectional and longitudinal comparisons are equivalent and when equivalent S selection factors are applied to these 2 designs, the results are similar. (12 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved). © 1980 American Psychological Association.
Botwinick, J; Siegler, IC
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