Relative Information Quantity Representation for Attribute Reduction of Decision Tables

Reduction of knowledge is one of the important topics in the research on the rough set theory.In this paper,the concept of the relative information quantity of decision table is introduced in the information system.In a consistent decision table,the equivalence properties between algebraic representation and relative information quantity representation of attribute reduction are proved.Through examples,it shows that attribute reduction of an inconsistent decision table cannot entirely be represented by relative information quantity.This shows that relative information quantity representation is more visual than algebraic representation,but it can't displace absolutely each other.