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Assignment of items to multiple categories requires suitable statistical methods. The present paper provides a new approach to solve this task. The concept of fuzzy sets is extended to cover sets (sets of overlapping clusters) in a simple manner introducing a vector of item membership sums. The application of the new concept is exemplified by modifying the fuzzy cluster analysis algorithm of Kaufman...
Questionnaire sorting is a concept for sorting mentioned by Coxon [(1999) SORTING DATA. Collection and Analysis. Thousand Oaks: Sage] and Harloff and Coxon [(2005), How to Sort. A Short Guide on Sorting Investigations. www.methodofsorting.com]. The use of questionnaire sorting is detailed herein. A paper questionnaire variant and a HTML form variant are introduced. Their equivalence among each other...
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