Question: Shampoo Sales. The time plot in Figure 18.10 describes monthly sales of a certain shampoo over a 3-year period. [Data are available in ShampooSales.csv, Source:

Shampoo Sales. The time plot in Figure 18.10 describes monthly sales of a certain shampoo over a 3-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 exponential smoothing • Double exponential smoothing • Holt-Winter’s exponential smoothing

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