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Fuzzy Set Approach

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Encyclopedia of Database Systems
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FormalPara Synonyms

Fuzzy MCDM; Fuzzy multicriteria decision-making

Definition

By multicriteria decision-making, we understand choosing the best alternative a i taken from a set A = {a 1, , a n } according to m criteria G 1, , G m . In classical theory, it is assumed that the criteria can be characterized precisely, and so, it is possible to decide unambiguously whether each alternative fulfills the given criterion or not. However, this is rarely the case in practice, and so, the fuzzy set approach has been proposed which makes it possible to assume that the criteria can be evaluated imprecisely, for example, “high quality, low reliability, very low weight,” etc. Unlike classical approach which first removes imprecision and then constructs a decision model, the fuzzy set approach removes imprecision only at the very end, if necessary.

The basic concepts of fuzzy decision-making are the following:

  1. 1.

    Decision based on the imprecisely defined set of alternatives, i.e., a fuzzy set of...

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Recommended Reading

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Correspondence to Vilém Novák .

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Novák, V. (2017). Fuzzy Set Approach. In: Liu, L., Özsu, M. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-7993-3_564-2

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  • DOI: https://doi.org/10.1007/978-1-4899-7993-3_564-2

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  • Print ISBN: 978-1-4899-7993-3

  • Online ISBN: 978-1-4899-7993-3

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