Jöreskog's (1970a) procedure for the analysis of simplex models was used to test Humphreys' (1968) assertion that eight semesters of undergraduate grade-point averages have a simplex form. Not only was this assertion confirmed but precise estimates of reliability and of unattenuated correlations were obtained.
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References
1.
Humphreys, L. G.Investigations of the simplex . Psychometrika, 1960, 25, 313-323.
2.
Humphreys, L. G.The fleeting nature of college academic success. Journal of Educational Psychology, 1968, 59, 375-380.
3.
Humphreys, L. G. and Taber, T.Postdiction study of the graduate record examination and eight semesters of college grades. Journal of Educational Measurement, 1973, 10, 179-184.
4.
Jöreskog, K. G.Estimation and testing of simplex models. The British Journal of Mathematical and Statistical Psychology, 1970, 23, 121-145. (a)
5.
Jöreskog, K. G.A general method for analysis of covariance structures. Biometrika, 1970 , 57, 239-251. (b)
