2012 | OriginalPaper | Buchkapitel
Beyond Traditional Fuzzy Uncertainty: Type-2 Fuzzy Techniques
verfasst von : Hung T. Nguyen, Vladik Kreinovich, Berlin Wu, Gang Xiang
Erschienen in: Computing Statistics under Interval and Fuzzy Uncertainty
Verlag: Springer Berlin Heidelberg
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For
fuzzy
information, we assumed that we have exact numerical degrees describing expert uncertainty. As we have mentioned in the previous chapter, in practice, an expert can, at best, provide bounds (i.e., an interval) or his or her degree of certainty – or even produce a “type-2”
fuzzy
degree of certainty (such as “about 0.6”).
As we have shown in Part I, processing of data under general type-1 fuzzy uncertainty can be reduced to the simplest case – of interval uncertainty: namely, Zadeh’s extension principle is equivalent to level-by-level interval computations applied to
α
-cuts of the corresponding fuzzy numbers.