Essential Graphing • Graph Builder Examples • Example of a Contour Plot

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Example of a Contour Plot
You have data about diamonds, including their carat weight and price. Examine the relationship between carat weight and price.
1.
Select Help > Sample Data Library and open Diamonds Data.jmp.
2.
Select Graph > Graph Builder.
3.
Select Price and drag it to the Y zone.
4.
Select Carat Weight and drag it to the X zone.
Figure 4.2 Points Showing Diamond Characteristics
You can see that the points are difficult to interpret. Some points overlap, making the density unclear.
Replace the points with a contour plot of their density.
5.
Right-click the plot and select Points > Change to > Contour.
6.
(Optional) Click Done.
Figure 4.3 Contour Plot of Diamond Characteristics
The darker areas indicate a higher density of observations. In Figure 4.3, use the crosshairs tool to verify the following:
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Most people in the sample purchased diamonds with a carat weight of about 0.34 to 0.57, 0.67 to 0.75, and 0.97 to 1.05.
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Most people who purchased diamonds with a carat weight around 0.5 paid about $100-$2,000.
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Most people who purchased diamonds with a carat weight of 0.70 paid about $1,600-$2,700.
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Most people who purchased diamonds with a carat weight of 1.0 paid about $3,800-$4,800.

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Help created on 3/19/2020