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Java Data Analysis

You're reading from   Java Data Analysis Data mining, big data analysis, NoSQL, and data visualization

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787285651
Length 412 pages
Edition 1st Edition
Languages
Concepts
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Author (1):
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John R. Hubbard John R. Hubbard
Author Profile Icon John R. Hubbard
John R. Hubbard
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Toc

Table of Contents (14) Chapters Close

Preface 1. Introduction to Data Analysis 2. Data Preprocessing FREE CHAPTER 3. Data Visualization 4. Statistics 5. Relational Databases 6. Regression Analysis 7. Classification Analysis 8. Cluster Analysis 9. Recommender Systems 10. NoSQL Databases 11. Big Data Analysis with Java A. Java Tools Index

Moving average

A moving average (also called a running average) for a numeric time series is another time series whose values are averages of progressive sections of values from the original series. It is a smoothing mechanism to provide a more general view of the trends of the original series.

For example, the three-element moving average of the series (20, 25, 21, 26, 28, 27, 29, 31) is the series (22, 24, 25, 27, 28, 29). This is because 22 is the average of (20, 25, 21), 24 is the average of (25, 21, 26), 25 is the average of (21, 26, 28), and so on. Notice that the moving average series is smoother than the original, and yet still shows the same general trend. Also note that the moving average series has six elements, while the original series had eight. In general, the length of the moving average series will be n – m + 1, where n is the length of the original series and m is the length of the segments being averaged; in this case, 8 – 3 + 1 = 6.

Listing 3-5 shows a test...

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