September 2017
Beginner to intermediate
412 pages
8h 55m
English
Content preview from Java Data AnalysisBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Time series
A time series is a dataset in which the first field (the independent variable) is time. In terms of data structures, we can think of it as a map—a set of key-value pairs, where the key is time and the value represents an event that occurred at that time. Usually, the main idea is of a sequence of snapshots of some object changing with time.
Some of the earliest datasets were time series. Figure 3-10 shows a page of Galileo's 1610 notebook, where he recorded his observations of the moons of Jupiter. This is time series data: the time is written on the left, and the changing object is Galileo's sketch of the positions of the moons relative to the planet.
Figure 3-10. Galileo's notes
More modern examples of time series include biometric, ...
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