Graph: Surface

Selecting Surface in the Graph Options dialog is one way to access the options described here. Use these options to customize various properties of 3D surfaces or 2D contours of 3D surfaces.  

Number of cuts for surface. The options available under Number of cuts for surface are used to specify the number of cuts for the surface (contour) plot.

X:, Y:. The surface will be drawn as a grid ("fish-net") over the plane; the values entered in the X: and Y: fields determine the coarseness of the grid. The larger the number of cuts, the smoother and more detailed will be the surface.

Y=X. You can set a common number of cuts for both the x and y dimensions by selecting the Y=X check box. Clear this check box to specify a different number of cuts in the two dimensions.

Contour plot. If you choose to Display the projected contours of the fitted surface (see below), you can select to show just the contour Lines, or to fill out the Areas between the contour lines. If necessary, click the Surface specs button (see below) to display the Surface Specifications dialog in which you can further refine the surface and contour colors and levels.

Surface (projected) contour. The options under Surface (projected) contour are used to add (or remove) a projected contour plot of the surface at a particular vertical (z-axis) distance from the surface.

Display. Select the Display check box to add the projected contour to the graph; clear this check box to remove it.

Place the surface. Enter in the Place the surface box the distance of the contour projection from the surface; the value entered here will be interpreted in terms of the percentage of the current vertical range (range of z values) of the fitted surface; the projected contour will be shown at the selected percent (of z) below the surface (i.e., the surface will be shown above the projected contour). For example, enter a large value (e.g., 200%) to move the projected contour to a point far below the surface; enter a very small value (e.g., 5%) to move the projected contour to point very close on the vertical axis to the lowest z-value defining the surface.

Legend (surface, contour). Use the options under Legend to select the detail of the legend for the levels (surface colors) of the plotted surface or contours. Also click the Surface specs button (see below) to display the Surface Specifications dialog, which is used to further refine the colors, numbers of levels (for the vertical or z axis), and other properties of the displayed surface.

Auto. Select the Auto option button to let STATISTICA choose a relatively small number of surface levels (heights in the vertical dimension) that represent the range of vertical values spanned by the surface; these surface levels will be shown and properly labeled (with the respective vertical z values) in the legend.

Full. Select the Full option button to show a separate legend symbol and color for every level (height in the vertical dimension) of the plotted surface. Click the Surface specs button (see below) to display the Surface Specifications dialog, which is used to set the colors and number of levels.

Major ticks. Select the Major ticks option button to show a separate legend symbol and color for every level (height in the vertical dimension) of the plotted surface marked by a major tickmark (on the vertical axis). Use this option button to establish a direct correspondence between the vertical axis scaling and the surface colors used in the plot.

No more than k intervals. The No more than k intervals option button is similar to the Auto option button; however, in addition it allows you to limit the number of vertical levels (heights in the vertical dimension) that are identified in the legend by entering a specific number of intervals in the corresponding edit field.

Surface specs. Click the Surface specs button to display the Surface Specifications dialog. This dialog provides full control of the colors, shading, and other surface and contour line options used in 3D and 2D contour (of 3D) plots.

Vertical (Z) axis tickmarks, options. Click this button to display the Vertical Axis dialog, which is used to customize the scaling for the vertical axis (z-axis).

Overlaid contour. Use the options in the Overlaid contour group box to control the display of the surface or contour plot. See also the Glossary entry for Overlaid Contour Plot.

Draw overlaid contour. Select this check box to draw overlaid plots for identifying "joint-regions" where multiple range requirements are simultaneously satisfied.

Fill pattern. Specify the fill pattern for the overlaid contour plot. This pattern will show the area of the plot that satisfies the criteria of both responses.

Circular surface/contour. Use the options in the Circular surface/contour group box to control the circular display of the surface or contour plot.

Display circular surface/contour. Select this check box to make the surface or contour plot circular instead of rectangular. When this check box is selected, the surface/contour will be circular, and additional options for controlling the radius of the circle and x and y grid will be enabled. When this check box is cleared, the surface/contour plot will have the same dimensions as the x, y, and z axes.

Draw sides of circular surface. When the Display circular surface/contour check box is selected, you can select this check box to add sides to the 3D surface plot. Note that this option is not available for contour plots.

Radius percent of full size. When the Display circular surface/contour check box is selected, you can enter the percentage for the radius of the circle in this field. The circle will fill the percentage of the graph indicated here; e.g., when 100 is entered, the circle will be drawn to the full extent of the x and y axes.

Allow X/Y lines for contour. Select this check box to enable the display of grid lines on the x and y axis of the contour plot.