5.2. Fuzzifier
The fuzzifier carries out fuzzification, which comprises the process of transforming crisp values into grades of membership for linguistic terms of fuzzy sets.
It begins with the transformation of the raw data using the functions that are expressed in Eq. (1).
During the process, linguistic labels are attached to the symptoms and the diagnostic steps are accompanied by associated degrees of intensity.
After the patient has provided the medical doctor with the symptoms, the medical doctor assigns subjective values to
the symptoms and supplies them to the system.
The system fuzzifies the values according to the function defined as: