6FAN J,YAN Q.Nonlinear Time Series:Nonparametric and Parametric Methods[M].Beijing:Science Press,sciencep,2006:10-13.
7BOX G,JENKINS G.Time Series Analysis,Forecasting and Control[M].San Francisco:Holden Day,1970:1-11.
8DICKEY D,FULLER W.Distribution of the estimators for autoregressive time series with a unit root[J]Journal of the American Statistical Association,1979,(74):427-431.
9AKAIKE H,Conanicial correlation analysis of time series and the use of an information criterion,in systems identification:Advances and case studies[M].New York:Academic Press,1976:27-96.