Modeling and Multivariate Methods - SAS

Chapter 23 Plotting Surfaces 545
The Surface Plot Control Panel
Independent Variables
The independent variables controls are displayed in Figure 23.8.
Figure 23.8 Variables Controls
Select the variables
for the x- and y-axes.
Lock the z-scale
Sliders and edit boxes
set the current value
of each variable
When there are more than two independent variables, you can select which two are displayed on the x- and
y-axes using the radio buttons in this panel. The sliders and text boxes set the current values of each variable,
which is most important for the variables that are not displayed on the axes. In essence, the plot shows the
three-dimensional slice of the surface at the value shown in the text box. Move the slider to see different
slices.
Lock Z Scale locks the z-axis to its current values. This is useful when moving the sliders that are not on an
axis.
Grid check boxes activate a grid that is parallel to each axis. The sliders allow you to adjust the placement of
each grid. The resolution of each grid can be controlled by adjusting axis settings. As an example,
Figure 23.9 shows a surface with the X and Y grids activated.