February 2023
Beginner
688 pages
14h 35m
English
Content preview from R All-in-One For Dummies
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Chapter 7
Correlation: The Rise and Fall of Relationships
IN THIS CHAPTER
Understanding what correlation is all about
Discovering how correlation connects to regression
Drawing conclusions from correlations
Analyzing items
In Chapter 6 of Book 3, I introduce the concept of regression, a tool for summarizing and testing relationships between (and among) variables. In this chapter, I introduce you to the ups and downs of correlation, another tool for looking at relationships.
I use the example of employee aptitude and performance from Chapter 6 of Book 3 and show how to think about the data in a slightly different way. The new concepts connect to what I show you in Chapter 6 of Book 3 and you’ll see how those connections work. I also show you how to test hypotheses about relationships and how to use R functions for correlation.
Understanding Correlation
A scatterplot is a graphical way of showing a relationship between two variables. In Chapter 6 of Book 3, I show you a scatterplot of the data for employees at FarMisht Consulting, Inc. I reproduce that scatterplot here as
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.