ABSTRACT
This chapter covers . . . . . . why we need logistic regression . . . what logistic regression does . . . what odds ratios are . . . how a researcher used logistic regression to study presidential approval . . . how researchers used logistic regression to study attitudes toward global warming
INTRODUCTION
Think about all of the dependent variables we’ve used throughout this book so far. Income. Number of times people have sex in a month. Hours of television watched. Student grade point averages. They all have something in common: they are all ratiolevel variables. They all start at zero and continue on from there: 1 hour, 2 hours, 5 hours, 10 hours, 24 hours of television a day (yes, there were actually five people in the 2012 GSS who claimed to watch television 24 hours a day). Much of the variation we want to explain involves ratio-level variables.
