Chapter 20

A Yes-or-No Proposition: Logistic Regression

In This Chapter

arrow Figuring out when to use logistic regression

arrow Getting a grip on the basics of logistic regression

arrow Running a logistic regression and making sense of the output

arrow Watching for things that can go wrong

arrow 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:

check.png Lived or died

check.png Did or didn’t rain today

check.png 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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