Chapter 20
A Yes-or-No Proposition: Logistic Regression
In This Chapter
Figuring out when to use logistic regression
Getting a grip on the basics of logistic regression
Running a logistic regression and making sense of the output
Watching for things that can go wrong
Estimating the sample size you need
You can use logistic regression to analyze the relationship between one or more predictor variables (the X variables) and a categorical outcome variable (the Y variable). Typical categorical outcomes include the following:
Lived or died
Did or didn’t rain today
Did or didn’t have a stroke
Responded or didn’t respond to a treatment
Did or did not vote for Joe Smith (in an exit poll) ...
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