SPSS Statistics Workbook For Dummies

Chapter 11

Making Predictions Using Linear Regression

IN THIS CHAPTER

Running a simple linear regression

Practicing with multiple linear regression

Interpreting regression coefficients

In this chapter, you practice producing linear regression output. And just as importantly, you practice interpreting the results as well.

Performing Simple Linear Regression

In Chapter 10, you learn that correlation helps establish the strength of the relationship between two variables. After you establish a relationship, you can use one variable to predict the other. To use the language of regression, you predict the dependent variables with one or more independent variables. We use the phrase simple linear regression when there is only one independent variable.

In this example, you use engine liters to predict miles per gallon:

1. Choose File  ⇒    Open  ⇒    Data and load the Cars_Regression.sav file.

   To download the file, go to the book’s companion website at www.dummies.com/go/spssstatisticsworkbookfd.

2. Choose Analyze  ⇒    Regression  ⇒    Linear.

   The Regression dialog appears.

3. Select the mpg variable and place it in the Dependent box.
4. Select the engine_liters variable and place it in the Block ...