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A Coefficient of Agreement for Nominal Scales

A Coefficient of Agreement for Nominal Scales AND EDUCATIONAL PSYCHOLOGICAL MEASUREMENT VOL. 1960 XX, No. 1, A COEFFICIENT OF AGREEMENT FOR NOMINAL SCALES 1 JACOB COHEN New York University CONSIDER Table 1. It in its formal characteristics represents situation which arises in the areas of clinical-social-personality level of where it occurs that the useful psychology, frequently only measurement obtainable is nominal 25- scaling (Stevens, 1951, pp. i.e. in a set of k unordered Because the 26), placement categories. of the units is a of some categorizing consequence complex judg- ment a meter&dquo; process performed by &dquo;two-legged (Stevens, 1958), it becomes to determine the extent to which these important judg- ments are reliable. The which reproducible, i.e., procedure suggests itself is that of two cate- (or more) having judges independently a of units and determine the and gorize sample degree, significance, TABLE 11 n Matrix Agreement of Proportions .02 .02 = .29 = .25 + + po .20 .09 .06 .35 + + pc = of chance the Parenthetical values are proportions expected on the hypothesis association, of the joint probabilities marginal proportions. of the Veter- From the Evaluation Project Psychology Service, Psychiatric ans Administration New York. are due Acknowledgements Hospital, Montrose, and A. whose discus- the http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Educational and Psychological Measurement SAGE

A Coefficient of Agreement for Nominal Scales

Cohen, Jacob
Educational and Psychological Measurement , Volume 20 (1): 10 – Apr 1, 1960
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References (7)

Publisher
SAGE
Copyright
Copyright © by SAGE Publications
ISSN
0013-1644
eISSN
1552-3888
DOI
10.1177/001316446002000104
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Abstract

AND EDUCATIONAL PSYCHOLOGICAL MEASUREMENT VOL. 1960 XX, No. 1, A COEFFICIENT OF AGREEMENT FOR NOMINAL SCALES 1 JACOB COHEN New York University CONSIDER Table 1. It in its formal characteristics represents situation which arises in the areas of clinical-social-personality level of where it occurs that the useful psychology, frequently only measurement obtainable is nominal 25- scaling (Stevens, 1951, pp. i.e. in a set of k unordered Because the 26), placement categories. of the units is a of some categorizing consequence complex judg- ment a meter&dquo; process performed by &dquo;two-legged (Stevens, 1958), it becomes to determine the extent to which these important judg- ments are reliable. The which reproducible, i.e., procedure suggests itself is that of two cate- (or more) having judges independently a of units and determine the and gorize sample degree, significance, TABLE 11 n Matrix Agreement of Proportions .02 .02 = .29 = .25 + + po .20 .09 .06 .35 + + pc = of chance the Parenthetical values are proportions expected on the hypothesis association, of the joint probabilities marginal proportions. of the Veter- From the Evaluation Project Psychology Service, Psychiatric ans Administration New York. are due Acknowledgements Hospital, Montrose, and A. whose discus- the

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Educational and Psychological Measurement – SAGE

Published: Apr 1, 1960

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