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: