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the Seattle Longitudinal Study (SLS), the first testing of which served as my doctoral dissertation at the Uni versity of Washington in 1956 and of which the sixth cycle is currently in progress. This work has been done within the framework of Thurstone's conceptualization of psychometric intelligence. Results of our previous efforts have been widely dissemi nated in the psychological and ger ontological literature, in a compre hensive report through Wave 4 of the study1 and in various analyses of the data from Waves 5 and 6.2-4 Here I provide a brief overview.
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K. Warner Schaie (1993) studied this question.
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