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企业四年的销售资料如下表,建立适当的ARMA模型,预测2000年各月的销售额。
| 月份 | | | | | | |
| 1985.01 | 10.93 | 9.34 | 11.00 | 10.98 | 11.29 | 11.84 |
| 1985.07 | 10.62 | 10.90 | 12.77 | 12.15 | 12.24 | 12.30 |
| 1986.01 | 9.91 | 10.24 | 10.41 | 10.47 | 11.51 | 12.45 |
| 1986.07 | 11.32 | 111.73 | 12.61 | 13.04 | 13.14 | 14.15 |
| 1987.01 | 10.85 | 10.30 | 12.74 | 12.73 | 13.08 | 14.27 |
| 1987.07 | 13.18 | 13.75 | 14.42 | 13.95 | 14.53 | 14.91 |
| 1988.01 | 12.94 | 11.43 | 14.36 | 14.57 | 14.25 | 15.86 |
| 1988.07 | 15.18 | 15.94 | 16.54 | 16.90 | 16.88 | 18.10 |
| 1989.01 | 13.70 | 10.88 | 15.79 | 16.36 | 17.22 | 17.75 |
| 1989.07 | 16.62 | 16.96 | 17.69 | 16.40 | 17.51 | 19.73 |
| 1990.01 | 13.73 | 12.85 | 15.68 | 16.79 | 17.59 | 18.51 |
| 1990.07 | 16.80 | 17.27 | 20.83 | 19.18 | 21.40 | 23.76 |
| 1991.01 | 15.73 | 13.14 | 17.24 | 17.93 | 18.82 | 19.12 |
| 1991.07 | 17.70 | 19.87 | 21.17 | 21.44 | 22.14 | 22.45 |
| 1992.01 | 17.88 | 16.00 | 20.29 | 21.03 | 21.78 | 22.51 |
| 1992.07 | 21.55 | 22.01 | 22.68 | 23.02 | 24.55 | 24.67 |
| 1993.01 | 19.61 | 17.15 | 22.46 | 23.19 | 23.40 | 26.26 |
| 1993.07 | 22.91 | 24.03 | 23.94 | 24.12 | 25.87 | 28.25 |