Stat 1000 Tips for Making a Side-By-Side Boxplot in JMP
Published: Fri, 10/08/10
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Tips for Making a Side-by-Side Boxplot in JMP
See my tip on Entering Data into JMP if you need help getting the data into JMP in the first place.
For example, some of you have a question on your assignment in Web Assign where they have given you data with GPA, IQ, etc. for both men and women (designated by 1 and 2 instead of male and female).
Select and copy the given data, then open a "New Data Table" in JMP. Select "Edit" then "Paste with Column Names" to paste the data into JMP.
IMPORTANT: Double-Click the "Gender" column to open up a pop-up menu and be sure to change the Data Type to "character" in the drop-down list. Click OK.
To get side-by-side boxplots for GPA by Gender: Select Analyze, Fit Y By X. In the pop-up menu that appears, in the list of columns, highlight "GPA" and click "Y, Response" then highlight "Gender" in the column list and click "X, Factor". Now click OK. You will now see an output screen showing two vertical arrays of dots, one called 1, one called 2 (the male and female genders). Click the red triangle and select "Display Options" and select "Box Plot" and your two side-by-side boxplots with the "points visible" as requested. Click the red triangle, select "Display Options" again and deselect "Grand Mean" if they want you to get rid of the grand mean.
The important thing when making side-by-side boxplots is to make sure your Y column's Data Type is Numeric and its Modeling Type is Continuous; whereas the X column's Data Type is Character and its Modeling Type is Nominal.
You can now copy and paste this output into your file ready to upload.
Those of you doing old-fashioned paper assignments have a question on your first assignment (this is not on the Web Assign assignments though) where they have given you a file of Oscar Winners and asked you to make a side-by-side boxplot showing the distribution of the age of Best Actor winners compared to the age of Best Actress winners.
Open the file. Select Analyze, Fit Y By X. In the pop-up menu that appears, in the list of columns, highlight "Age" and click "Y, Response" then highlight "Award" in the column list and click "X, Factor". Now click OK. You will now see an output screen showing two vertical arrays of dots, one called Actor, one called Actress. Click the red triangle and select "Display Options" and select "Box Plot" and your two side-by-side boxplots with the "points visible" as requested. Click the red triangle, select "Display Options" again and deselect "Grand Mean".