Comparability of IQ scores over time |
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| Authors: | Olev Must Jan te Nijenhuis Aasa Must Annelies E.M. van Vianen |
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| Affiliation: | 1. Baylor University, United States;2. Tartu University, Estonia;3. University of Amsterdam, The Netherlands;4. Estonian Defence College, Tartu, Estonia;1. University of Tartu, Estonia;2. Estonian National Defense College, Estonia;1. Work and Organizational Psychology, University of Amsterdam, Amsterdam, The Netherlands;2. Social and Organizational Psychology, Free University, Amsterdam, The Netherlands;1. Center for Economic Behavior and Inequality (CEBI) and Department of Economics, University of Copenhagen, Øster Farimagsgade 5, Copenhagen K 1353, Denmark;2. IZA, Institute of Labor Economics, Germany |
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| Abstract: | This study investigates the comparability of IQ scores. Three cohorts (1933/36, 1997/98, 2006) of Estonian students (N = 2173) are compared using the Estonian National Intelligence Test. After 72 years the secular rise of the IQ test scores is.79 SD. The mean .16 SD increase in the last 8 years suggests a rapid increase of the Flynn Effect (FE) in Estonia. The measurement is not strictly invariant, which means that the IQ scores of different cohorts are not directly comparable. Less than perfect comparability of test scores is caused by at least two factors: time between measurements and societal/educational changes between cohorts. As was to be expected, the meaning of subtests and the meaning of the g score have changed over time. |
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