Chapter 19
Looking for Links: Correlation and Regression
IN THIS CHAPTER
Exploring statistical relationships between numerical variables
Looking at correlation and linear regression
Making predictions based on known relationships
Considering correlation versus causation
Today’s media provide a steady stream of information, including reports on all the latest links that have been found by researchers. Just today I heard that increased video game use can negatively affect a child’s attention span, the amount of a certain hormone in a woman’s body can predict when she will enter menopause, and the more depressed you get, the more chocolate you eat, and the more chocolate you eat, the more depressed you get (how depressing!).
Some studies are truly legitimate and help improve the quality and longevity of our lives. Other studies are not so clear. For example, one study says that exercising 20 minutes three times a week is better than exercising 60 minutes one time a week, another study says the opposite, and yet another study says there is no difference.
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