Chap2( Forecasting )2015-4-2(第5周 ).pptVIP

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Chap2( Forecasting )2015-4-2(第5周 )

* Methods for Seasonal Series Forecast made on Deseasonalized demand by MA MA(6) for period 9=20.52 (without seasonality); Forecast for period: 20.52?0.558=11.45 (with seasonality) Forecast made on Deseasonalized demand by regression By regression analysis over D. D., obtain: Dt=16.8+0.7092t By substituting t=9 through 12, obtain forecasts (without seasonality): 23.18, 23.89, 24.60 and 25.31; By multiplying seasonal factors, obtain forecast in the future periods 9 through 12: 12.93, 25.35, 34.81, and 24.45. * The End for Chapter 2 ! * Example 2.2 Quarterly data for the failures of certain aircrft engines at a local military base during the last two yrs are 200, 250, 175, 186, 225, 285, 305, 190. Determine the one-step-ahead forecasts for period 4 through 8 using three-period moving averages, and one-step-ahead forecasts for periods 7 and 8 using six-period moving averages MA(3)4=(1/3)(175+250+200)=208 MA(3)5=(1/3)(186+175+250)=204 MA(6)7=(1/6)(285+225+186+175+250+200)=220 The final results are as shown in the table on Page 67 Question: How to obtain multiple-step-ahead forecast? For example, using MA(3) in period 3 for period 6, MA(3)6, 3 period ahead. * Methods of Forecasting Stationary Series Fig. 2-9 Demand History for Example 2.7 N=4 subjective 主观 qualitative 定性 objective 客观的 statistical 统计的 quantitative 定量 notation 表示法 gas-guzzler 耗油量大的汽车;油老虎 embargoing禁运 demise失败 Shift Scheduling Problem 班次排班问题 solicit KK: [] DJ: [] vt. 1. 请求;恳求;乞求[(+for)] He solicited aid from his close friends. 他请求挚友相助。 2. 征求;征集[(+from)] They are busy soliciting votes. 他们正忙着拉选票。 3. 诱惑;勾引...做坏事 4. (妓女)拉(客) 5. 引发,诱发 vi. 1. 请求;恳求;乞求;征求[(+for)] They solicited for contributions to a charity. 他们为一项慈善事业征求捐款。 2. (妓女)拉客 Submit 提交 计量经济 infer KK: [] DJ: [] vt. 1. 推断,推论;猜想[(+from)][+(that)] I infer that my proposal has been accepted. 我推测我的建议已被接受。 variation 变化 notation KK: [] DJ: [] n. 1. 标记法[U] Music has a special system of notation. 音乐有一套专用的标志法。 2. 记号,标志;乐谱;棋谱符号[C][S1] 3. 注释;批注;记录[C]

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