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In this paper, nonparametric method in statistics is introduced to analyze the reduction of ordinal attributes. Firstly,Goodman-Kruskal gamma coefficient, which is used to measuring the correlativity between ordinal variables in statistics, is now used as a new measure of correlativity between ordinal attribute sets after modifying it properly. Then, based on this new measure, a new method of attribute...
Dominance-based rough set approach has recently become a routine method to deal with preference-ordered data, and knowledge reduction method based on rough set theory has been proposed. However, the results obtained are usually short of statistical significance. In this paper, non- parametric methods in statistics are introduced to analyze ordered information systems and ordered decision tables. Spearman...
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