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Educational and Psychological Measurement
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On the Use of the G Index in O-, P-, Q-, R-, S-, and T-Analyses

Jan Vegelius

University of Uppsala, Sweden

Bo Edvardsson

University of Örchro, Sweden Uppsala, Sweden

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.

Educational and Psychological Measurement, Vol. 39, No. 4, 707-710 (1979)
DOI: 10.1177/001316447903900401
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