Extended clusters of grey incidences for panel data and its application

Firstly,the paper analysed the data structure of panel data.Then a cluster of curved surfaces were employed to described their geometric characteristic.Thereafter,in three dimensional space,the paper researched the geometric similarity of indexes in panel data.According to the principle of grey incidence analysis,an extended absolute degree of grey incidences was proposed,which maintained the consistent form of the classic incidences.Meanwhile,the formula of zeroing starting point operator and incidence parameters were redefined.On this basis,the paper constructed the extended incidence matrix of indexes,and discussed the clustering analysis process of panel data.Finally,it studied an instance,the results prove the method is effective.