Practical Applications of Data Mining

188 Chapter 5 rough SetS and BayeS’ theorieS

we conclude that it belongs to concept Y with the conditional probability

P(Y|X

i

) greater than or equal to the parameter b.

5.3.2 Reduction of Condition Attributes 

and Generation of Decision Rules

Reducing condition attributes and generating decision rules based on them

are the two fundamental concepts of rough set. Reduct, a reduced condition

attribute set, is produced as a result of reducing condition attributes and is the

essential part of an information system that can discern all objects discernible

by the original information system. Some condition attributes that cannot

provide any additional information about the objects in U are often included

in the information system. Removing ...