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1 2001

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(alfa, beta) reduction of decision table : a rough approach

Shrabonti G., Ranjit B., Alam S. S.

Foundations of Computing and Decision Sciences

2001

Vol. 26, No. 4

273-281

In this paper, we generalise Pawlak's rough approach for simplifying a decision table in an information system. We consider an information system where attribute values are not always quantitative, rather subjective having vague or imprecise meanings. Some objects may have attribute values which are almost identical, i.e., they can't be distinguished clearly by the attributes. Considering this observation, we present a generalised method for reduction of decision table for different choice values of alfa and beta, a being for condition attributes and beta for decision attributes where Alfa, Beta € [0, 1]. For a = 1 and Beta = 1, the method reduces to Pawlak's method.