| 模型 | AR(1) | AR(2) | MA(1) | MA(2) | ARMA(1,1) | ARMA(1,2) | ARMA(2,1) | ARMA(2,2) |
| AIC数值 | 1999.36 | 2001.28 | 2001.12 | 2001.09 | 2001.29 | 2003.08 | 2001.97 | 2003.85 |