A new grey relational degree model for panel data and its application

Grey relational degree mainly reflects the geometric similarity of data series. The panel data is regarded as the sample matrix series in this paper. The matrix series is plunged into the space rectangular coordinate system. The sample data extend to the discrete curved surface that consists of the triangle plane. This paper constructs the gray relational coefficient using the angle between the planes, and then constructs the grey relational degree formula. The properties of relational formula are discussed also. At the end, we give a case in order to validate the new model.