The possibility of using the G index and its generalizations in the six basic factor analytic designs is discussed. For O- and Q-analyses G should be used if there is no mutual direction of all the variables, as G is invariant over variable reflection. In all the six designs G should also be used if the scale centre is more suitable as a reference point than the mean value.
Get full access to this article
View all access options for this article.
References
1.
Cattell, R. B.On the disuse and misuse of P, Q, Qs and O techniques in clinical psychology. Journal of Clinical Psychology, 1951, 7, 203-214.
2.
Cattell, R. B.The three basic factor-analytic research designs—their interrelations and derivatives. Psychological Bulletin, 1952, 49, 499-520.
3.
Cohen, J.rc: A profile similarity coefficient invariant over variable reflection. Psychological Bulletin , 1969, 71, 281-284.
4.
Holley, J. W.Rorschach analysis. In Kline, P.: New approaches in psychological measurement. London: Wiley, 1973.
5.
Holley, J. W. and Guilford, J. P.A note on the G index of agreement. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1964, 24, 749-753.
6.
Holley, J. W. and Kline, P.On the generalization of the G index of agreement, Go, for use with ordinal scores. Scandinavian Journal of Psychology, 1976, 17, 149-152.
7.
Holley, J. W. and Sjöberg, L.Some characteristics of the G index of agreement . Multivariate Behavioral Research, 1968 , 3, 107-114.
8.
Sjöberg, L. and Holley, J. W.A measure of similarity between individuals when scoring directions of variables are arbitrary. Multivariate Behavioral Research, 1967, 2, 377-384.
9.
Vegelius, J.On generalizations of the G index. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1976, 36, 595-600.
10.
Vegelius, J.An ordinal scale generalization of the G index invariant over item reflection. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1977, 37, 31-35. (a)
11.
Vegelius, J.The problem of varying scales for G index generalizations. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1977, 37, 279-282. (b).
12.
Vegelius, J.On the weighted G index. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1977, 37, 839-842. (c)
13.
Vegelius, J.A note on the G analysis for nondichtomized data. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT , 1978, 38, 11-14.
14.
Vegelius, J. A.A G index generalization for trichotomized data. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT , 1979, 39, 23-27.
