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The J-Index as a Measure of Nominal Scale Response Agreement
Svants Janson
University of Uppsala
Jan Vegelius
University of Uppsala
Some characteristics of Hubert's , as a measure of nominal scale response agreement, are shown, including the characteristic that in a contingency table with equal frequencies its value will normally not be zero. By making a slight modification of its definition, some of these characteristics can be eliminated. As another alternative, the J-index is suggested. It is closely related to but does not have the same problematic characteristics. Some asymptotic variance formulas for the J-index are given, together with a numerical example.
Applied Psychological Measurement, Vol. 6, No. 1,
111-121 (1982)
DOI: 10.1177/014662168200600111

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M. J. Warrens
A Comment on ''The J Index as a Measure of Nominal Scale Response Agreement''
Applied Psychological Measurement,
September 1, 2009;
33(6):
486 - 487.
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