Abstract
This paper proposes an approach to construct fuzzy graphs with linguistic inputs-outputs by fuzzy approximation models. Linguistic inputs can be transformed into linguistic outputs through fizzy systems. In this paper, we consider fuzzy approximation models as fuzzy relations to represent linguistic inputs-outputs. In fuzzy regression, two approximation models, i. e. the possibility and necessity models, can be considered. Always there exist a possibility model when a linear system with fuzzy coefficients is considered, but it is not assured to attain a necessity model in a fuzzy linear system. The absence of a necessity model is caused by adopting a model not fitting to the given data Thus we consider polynomials to find a more refined regression model. If we can find a proper necessity model, the necessity and possibility models deserve more credit than the previous models in the timer studies. The measure of fitness is used to gauge the degree of approximation of the obtained models to the given data. The obtained approximation models themselves can be regarded as fizzy graphs. Furthermore, by the obtained approximation models, we can construct another fuzzy graphs which represent linguistic inputs-outputs relations. The possibility and necessity models in fuzzy regression analysis can be considered as the upper and lower approximations in rough sets. Similarities between the fuzzy regression and the rough sets concept are also discussed.
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Lee, H., Tanaka, H. (1999). Fuzzy Graphs with Linguistic Inputs-Outputs by Fuzzy Approximation Models. In: Zadeh, L.A., Kacprzyk, J. (eds) Computing with Words in Information/Intelligent Systems 2. Studies in Fuzziness and Soft Computing, vol 34. Physica, Heidelberg. https://doi.org/10.1007/978-3-7908-1872-7_5
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DOI: https://doi.org/10.1007/978-3-7908-1872-7_5
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