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The Effects of Age-Based and Grade-Based Sampling on the Relative Standing of Countries in International Comparative Studies of Student Achievement.
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O'Leary, Michael – 2000
The investigation reported in this paper was prompted by discrepancies between the published outcomes from two international tests of science achievement: (1) the Second International Assessment of Educational Progress (IAEP2), administered in 1991; and (2) the Third International Mathematics and Science Study (TIMSS), administered in 1995. One…
Descriptors: Academic Achievement, Achievement Tests, Adolescents, Age Differences