The time plot in Figure 19 18 describes monthly sales of a certain shampoo over a three year period Data are available in ShampooSales csv, Source Hyndman and Yang (2018) Which of the following methods would be suitable for forecasting this series if applied to the raw data Moving average Simple ex...

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The time plot in Figure 19.18 describes monthly sales of a certain shampoo over a three-year period.

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The time plot in Figure 19.18 describes monthly sales of a certain shampoo over a three-year period. [Data are available in ShampooSales.csv, Source: Hyndman and Yang (2018).]

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Which of the following methods would be suitable for forecasting this series if applied to the raw data?
• Moving average

• Simple exponential smoothing

• Double exponential smoothing

• Holt-Winters exponential smoothing

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The time plot in Figure 19.18 describes monthly sales of a certain shampoo over a three-year period.

Question:

Units (in 000s) 700 600- 500- 400- 300- 200- 100 Jan Jul Jan Jul Jan Jul 1995 1996 1997 Jan 1998 Time

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