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Daily sales of paperback and hardcover books at the same store.

Usage

books

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)