Practical Applications of Data Mining

358 Chapter 8 Fuzzy InFormatIon retrIeval

figure, it can be observed that the value of min is equal to 0.1 and the value of

max is equal to 0.6:

F

usually high

(x) = 1/2 + 1/2 × sin((1.5 + (x – min)/(max – min)) × p( ))

Every degree of membership in the x-axis over 0.6 yields 1 as the degree of

membership F(x) for usually high. The following query is an example that

applies the hedge usually to the primary term high. The result of the query

is partially shown in Table 8.9.

SELECT country FROM table WHERE no._of_visitors = usually high

TABLE  8.9 Data for no._of_visitors = usually high

Country

No. of

visitors

Membership

for high

Membership for ...