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Lesson 20. Capstone: Time series

This capstone covers

• Learning the basics of time-series analysis
• Combining multiple time series with Monoid and Semigroup
• Using Map to solve problems of duplicate values in a time series
• Avoiding errors involving missing values by using Maybe

In this capstone, you’ll model time-series data by using tools you’ll build in Haskell. Time-series data is, in theory, relatively simple: it’s a series of values and dates for each piece of data. Figure 20.1 presents sales data from the Box & Jenkins data set that’s commonly used to demonstrate a time series (the data used in this capstone is also a subset of the first 36 months of this same data).

Figure 20.1. An example of time-series data for sales

Although conceptually ...