Daily sales of paperback and hardcover books at the same store.
Format
Bivariate time series containing the following columns:
- Paperback
Number of paperback sales each day
- Hardcover
Number of hardcover sales each day
Source
Makridakis, Wheelwright and Hyndman (1998) Forecasting: methods and applications, John Wiley & Sons: New York. Exercise 4.5.
Examples
plot(books)
