两个原因很难判断
1.你的数据量太少
2.一般判断根据SIC,AIC等
Lag: Log-likelihood Akaike Schwarz Hannan-Quinn
1 -133.327 -135.327 -136.623 -135.712
2 -118.377 -124.377 -128.265 -125.533
3 -100.248 -110.248 -116.728 -112.175
4 -79.6928 -93.6928 -102.764 -96.3901


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