1. Sources of Data
The two naive forecasting methods discussed in this chapter and also other more advanced time-seies methods require historical data series.
Multiple-Regression methods require a data series for each variable.
Sources of data series are:
Internal records of the organization
Trade associations, governmental resources
Web addresses

2. Forecasting Domestic Car Sales
The forecasting methods that will be introduced in following chapters will be applied to domestic car sales data and using RMSE their performance will be compared throughout the chapters.
A modified naive model to forecast domestic car sales:
DCSFt = DCSt-4

3. Figure 1-4

4. Table 1-6

5. Table 1-6 (continued)

6. Table 1-7

7. Figure 1-5

8. Table 1-8

9. Table 1-9

10. Table 1-9 (continued)

11. Table 1-9 (continued)

12. Figure 1-6

13. Table 1-10