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An Ordinal Scale Generalization of the G Index Invariant Over Item Reflection

University of Uppsala, Sweden

A new type of scale, called the bipolar ordinal scale, is defined with assumptions slightly stronger than those of the normal ordinal scale. A similarity index, called r _BP, is defined between persons with scores on this scale. It is invariant over item reflection. It is also an E-correlation coefficient and can thus be used in a Q-analysis.

Educational and Psychological Measurement, Vol. 37, No. 1, 31-35 (1977)
DOI: 10.1177/001316447703700104


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