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SAS/INSIGHT Software |

If a set of observations all have the same (x, y) values, the mean Z value of the set is used as the Z value at point (x, y) for the purpose of fitting the surface.

- Grid Size:Horizontal Size
- specifies the horizontal resolution of the rectangular grid over which surface and ZColor functions are evaluated.
- Grid Size:Vertical Size
- specifies the vertical resolution of the rectangular grid over which surface and ZColor functions are evaluated.
- Fit:Linear Interpolation
- linearly interpolates surface and ZColor functions across rectangular grid cells.
- Fit:Thin-Plate Smoothing Spline
- fits surface and ZColor functions over the rectangular grid using thin-plate smoothing spline fitting. The process may be much slower than linear interpolation. It usually produces very smooth surfaces and colors.
- Number of Contour Levels
- specifies the number of contour levels to be drawn over the surface. The contour levels are spaced evenly within the range of the ZColor variable or the Z variable if there is no ZColor variable specified.

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