Knowledge feature analysis to incomplete information system

The Variable Precision Rough Set (VPRS) model extends the basic Rough Set (RS) theory with finite universes and finite evaluative measures. VPRS is concerned with the equivalence and the contained relationship between two sets. In incompatible information systems, the inclusion degree and ß upper (lower) approximation of the inconsistent equivalence class to the decision equivalence classes may be affected by the variable precision. The analysis of an example decision table shows that there is a critical point in ß available-values region. In the new ß range limited at the critical point, the incomplete decision table can be converted to the coordination decision table reliably. We introduce a way and its algorithm implement for the critical value search. The inconsistent equivalence class transformation is performed.