JOURNAL OF MULTIPLE-VALUED LOGIC AND SOFT COMPUTING, cilt.17, ss.459-473, 2011 (SCI İndekslerine Giren Dergi)
When expressing any data in linguistic terms related to a quality characteristic, traditional statistical techniques are insufficient to capture the vagueness in the data. Linguistic data can be transformed into numerical values to handle them with traditional statistical techniques by using the fuzzy set theory. Fuzzy systems are suitable for uncertain or approximate reasoning, especially for the system with a mathematical model that is difficult to derive. The fuzzy set theory allows decision making with estimated values under incomplete or uncertain information.