Create a Stacked Bar

To determine if one school had more students with breathing problems in any given month than the others, you can create a stacked bar of the WMonth variable with a series bar for each value of SchoolNum. This will show you, for example, that School A did not have any students who answered that their worst breathing month was December.

1. Click Graph.

2. From the Graph Type drop-down, select Stacked Bar.

3. From the Main Variable drop-down, select WMonth.

4. From the SERIES Bar for Each Value, select SchoolNum.

5. Click OK. Epi Graph opens. Notice that the months are not in sequence by month, but by the first digit of the number. In Lesson 7 Exporting Files, you will use the RECODE command to re-order the months to appear in the proper sequence.

Your stacked bar graph should look similar to the following:

6. Right click the graph and select Customization Dialog from the pop-up menu.

7. Click the Plot tab.

8. From the Plot Style section, select Points and Spline.

9. Click Apply.

10. Click OK.

The same worst month information is now presented in a Points and Spline format.

11. Right click the graph and select Customization Dialog from the pop-up menu.

12. Click the Plot tab.

13. Select Area Stacked.

14. Click Apply.

15. Click OK.

• The same worst month information is now presented in an Area graph format.

16. Close Epi Graph.