Computation of reducts of composed information systems
Fundamenta Informaticae - Special issue: rough sets
Rules in incomplete information systems
Information Sciences: an International Journal
On semantic issues connected with incomplete information databases
ACM Transactions on Database Systems (TODS)
On Databases with Incomplete Information
Journal of the ACM (JACM)
Information Sciences—Informatics and Computer Science: An International Journal
Incomplete Information: Rough Set Analysis
Incomplete Information: Rough Set Analysis
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Rough sets based minimal certain rule generation in Non-deterministic Information Systems (NISs) is presented. This is advancement from rule generation in Deterministic Information Systems (DISs). NISs were proposed by Pawlak, Orłowska and Lipski in order to handle information incompleteness in DISs. According to the previous research on rule generation in DISs, rules in NISs are defined by logical implications satisfying some constraints. Rough sets based algorithms for generating rules are also proposed. Especially in this paper, minimal certain rules are focused on, and discernibility functions are newly introduced into NISs. A minimal certain rule is generated by means of a solution of a discernibility function. This procedure is implemented on a workstation in prolog.