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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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5.1 3D Scatterplots

Consider the data in file CARS.MTW already described in Chapter 4.

Graph > 3D Scatterplot

nc05uf001.eps

Enter the price in Z variable; power in Y variable, and displacement in X variable. Using default options we obtain:

nc05uf002.eps

Notice that when the graph window opens, so also does the toolbar 3D Graph Tools, which allows the graph to be acted on interactively.

nc05uf003.eps

The properties of the graph can be modified by double clicking on the item you want to change (points, axes, …).

The Brush option can also be used in 3D scatterplots. To activate it, click on the indicated icon in the Graph Editing toolbar.

nc05uf004.eps

At times, it may be useful to draw lines joining each data point to its base. To do so, when constructing the graph, check the option Project lines in Data Display.

nc05uf005.eps

5.1.1 Stratification

Graph > 3D Scatterplot

The dialog box is similar to the previous case (without stratification), ...

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