Basic Analysis and Graphing - SAS

122 Performing Bivariate Analysis Chapter 4
Additional Examples of the Bivariate Platform
slope of the fitted line shifts closer to the Y by X fit. Likewise, when you decrease the ratio, the slope of the
line shifts closer to the X by Y fit.
Example of Group By Using Density Ellipses
This example uses the Hot Dogs.jmp sample data table. The Type column identifies three different types of
hot dogs: beef, meat, or poultry. You want to group the three types of hot dogs according to their cost
variables.
1. Open the Hot Dogs.jmp sample data table.
2. Select Analyze > Fit Y by X.
3. Select $/oz and click Y, Response.
4. Select $/lb Protein and click X, Factor.
5. Click OK.
6. From the red triangle menu, select Group By.
7. From the list, select Type.
8. Click OK. If you look at the Group By option again, you see it has a check mark next to it.
9. From the red triangle menu, select Density Ellipse > 0.90.
To color the points according to Type, proceed as follows:
10. Right-click on the scatterplot and select Row Legend.
11. Select Type in the column list and click OK.
Figure 4.23 Example of Group By
The ellipses in Figure 4.23 show clearly how the different types of hot dogs cluster with respect to the cost
variables.