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A Modified Cochran-Friedman Test with Missing Observations and Ordered Categorical Data

Jerome Klotz
Biometrics
Vol. 36, No. 4 (Dec., 1980), pp. 665-670
DOI: 10.2307/2556119
Stable URL: http://www.jstor.org/stable/2556119
Page Count: 6
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A Modified Cochran-Friedman Test with Missing Observations and Ordered Categorical Data
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Abstract

A modification of Friedman's statistic is proposed in order to extend Cochran's test to situations with more than two ordered categories of response. The modification arises from a need to handle missing observations in some categories. A Scheffé-type multiple comparison procedure that uses the asymptotic chi square approximation is also given. A motivating example which compares multiple evaluation criteria on breast-cancer data is presented.

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