Abstract
As one of the useful extensions of classical rough set approach, the dominance-based rough set approach has been successfully applied into multi-criteria decision problems. However, the traditional dominance-based rough set approach is only suitable for the condition attributes, which are positively related with classification analysis. To solve this problem, we propose an extension of the dominance-based rough set approach in incomplete information system by assuming the condition attributes, which are not only positively but also negatively related with classification analysis. Furthermore, by considering the existence of unknown values in incomplete information system, we present the concept of valued dominance relation, which shows the probability of an object is dominating another one with respect to the condition attributes. By using the valued dominance relation, the fuzzy dominance-based rough set models are also studied. A numerical example is employed to substantiate the conceptual arguments.
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