CHAPTER 4

Know Your Time Series

4.1. Data Availability

A time series is a sequence of similar measurements taken at regular time intervals. Time series analysis, our topic in Chapters 4, 5, 6, 7, and 9, means examining the history of the time series itself to gather information about the future. An inherent assumption in time series analysis is that the past of a series contains information about the future of the same series. Regression modeling, which is our topic in Chapter 8, means using the information contained in another data series to make predictions about the future of a focal time series.

One essential aspect of time series forecasting is that time needs to be “bucketed” into time periods. Many demand forecasts are made on a monthly ...

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