Two Direction S-Rough Decision and Rough Decision Law Mining

Two direction S-rough sets has two direction dynamic characteristics. By employing two direction S-rough sets, a generation method of two direction S-rough decision law is presented. The concepts of upper-decision law, lower-decision law, two direction S-rough decision law, two direction S-rough decision law kernel, two direction S-rough decision law band and two direction S-rough decision law hull are proposed. The theorems about decision law transfer and decision law mining are presented. The criterion of rough decision law mining is given.