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Uncertainty measures for interval type-2 fuzzy sets. (English) Zbl 1141.28010
Based on the representation theorem for interval type-2 fuzzy sets, 4 types of new uncertainty measures are introduced and discussed, namely cardinality, fuzziness, variance and skewness. Note that the first uncertainty measures for this type of fuzzy sets, namely the centroid, was introduced already in [N. N. Karnik and J. M. Mendel, Inf. Sci. 132, No. 1–4, 195–220 (2001; Zbl 0982.03030)]. The authors give formulae for computing the introduced uncertainty measures, discuss their properties and include several illustrative examples.

28E10 Fuzzy measure theory
94D05 Fuzzy sets and logic (in connection with information, communication, or circuits theory)
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