Basic Analysis and Graphing - SAS

Chapter 4 Performing Bivariate Analysis 123
Statistical Details for the Bivariate Platform
Example of Group By Using Regression Lines
Another use for grouped regression is overlaying lines to compare slopes of different groups.
1. Open the Big Class.jmp sample data table.
2. Select Analyze > Fit Y by X.
3. Select weight and click Y, Response.
4. Select height and click X, Factor.
5. Click OK.
To create the example on the left in Figure 4.24:
6. Select Fit Line from the red triangle menu.
To create the example on the right in Figure 4.24:
7. From the Linear Fit menu, select Remove Fit.
8. From the red triangle menu, select Group By.
9. From the list, select sex.
10. Click OK.
11. Select Fit Line from the red triangle menu.
Figure 4.24 Example of Regression Analysis for Whole Sample and Grouped Sample
The scatterplot to the left in Figure 4.24 has a single regression line that relates weight to height. The
scatterplot to the right shows separate regression lines for males and females.
Statistical Details for the Bivariate Platform
This section contains statistical details for selected commands and reports.