As illustrated in Table 2, simple grid approach gave the
best performance overall while the mean and standard
deviation approach also performed reasonably well.
It may be noted that a single fuzzy if-then rule for each
class is not always sufficient for real-world pattern
classification problems. While each approach is very
simple and has some drawbacks as discussed above, fuzzy
rule-based systems have high classification ability as
shown in this paper. The performance of fuzzy rule based
systems can be further improved by feature selection and
optimizing the rule selection and various rule parameters.