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SAS/INSIGHT Software

Method

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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Copyright © 1999 by SAS Insitute Inc., Cary, NC, USA. All rights reserved.