July 2025
Beginner
464 pages
9h 31m
English
Content preview from Statistical Analysis with R For Dummies, 2nd Edition
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Chapter 4
Finding Your Center
IN THIS CHAPTER
Working within your means
Meeting conditions
Understanding that the median is the message
Getting into the mode
If you’ve ever worked with a set of numbers and had to figure out how to summarize them with a single number, you’ve faced a situation that statisticians deal with all the time: Where would this ideal “single number” come from?
A good idea might be to select a number from somewhere in the middle of the set. That number could then represent the entire set of numbers. When you’re looking around in the middle of the set, you’re looking at central tendency. You can address central tendency in a variety of ways.
Means: The Lure of Averages
We’ve all used averages. Statisticians refer to the average as the mean. The mean is an easy way to summarize your spending, your school grades, or your performance in a sport over time.
In the course of their work, scientists calculate means. When a researcher does a study, they apply some kind of treatment or procedure to a small sample of people or things. Then they measure the results and ...
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