
202 Chapter 5 rough SetS and BayeS’ theorieS
Here, the symbol ∧ denotes the conjunction operator.
The final set of all maximally general rules for this information system
S can be stated as follows:
When we apply rough-set theory to the welding current region 200–250
A(a
7
=
2), or the welding voltage 25–30 V(a
1
= 6) matches with the welding
current 200–250 A(a
7
= 2), then the higher-quality welding product will
be obtained.
We can easily see the result in Figure 5.3.
5.4.4 Classification of Automobiles Using Both
Bayes’ and Rough Set Theory
In this example, we consider a dataset representing a collection of cars as
shown in Table ...