On key elements of early warning of university student psychological crisis based on limited dominance relation rough sets

The common early warning index system of university student psychological crisis which is constructed based on the expert experience has strong subjectivity and big redundancy.The information system based on such index system is an incomplete ordered system.For this problem,a method of index reduction based on limited dominance relation rough sets is proposed.By introducing the limited dominance relation into partial consistency reduction of the target information system,the partial consistency function and partial consistency discernable matrix are built to reduce the early warning indexes and to obtain the key indexes which lead to student psychological crisis.An example demonstrates the validity of this method.