The VPRS Model Based on Set Pair Analysis in Incomplete Fuzzy Information System

In this paper, the author proposed the concept of incomplete and fuzzy information systems based on incomplete approximation spaces and fuzzy sets, and analyzed the approximate class-precision and boundary in rough set systemically, via introducing the thought of inner & outer boundaries and inner & outer approximate definable sets combining rough set with fuzzy set, variable precision theory, set pair analysis(SPA), put forward a feasible model and a precision reduction method, did some work on improving class precision in rough set.