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Academic Achievement	2
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Application of a Simplex Process Model to Six Years of Cognitive Development in Four Demographic Groups.

Peer reviewed

Humphreys, Lloyd G.: And Others – Applied Psychological Measurement, 1979

A simplex process model of the cross-lagged correlation paradigm was applied to 16 tests administered to samples of Black and White males and females in grades 5, 7, 9, and 11. Relationships among the measures as well as the use of the model are discussed. (Author/JKS)

Descriptors: Academic Achievement, Achievement Tests, Data Analysis, Elementary Secondary Education

Intellectual Status and Intellectual Growth Again

Peer reviewed

Werts, C. E.; Hilton, T. L. – American Educational Research Journal, 1977

To correct for measurement error in the correlation of student status with achievement gain, the simplex model was used. Results supported the authors' hypothesis that status and gain are correlated. Students who start out as low achievers may need more help over time to maintain the same academic growth as higher achievers. (Author/MV)

Descriptors: Academic Achievement, Achievement Gains, Basic Skills, Elementary Secondary Education