Rotating Plot

Method

Observations with missing values for Z, Y, X variables are not used. If there are observations that all share the same values for the X and Y variables, then the mean Z value of the set is used for the purpose of fitting a surface to the data set.

Clicking on the Method button in the variables dialog displays the dialog in Figure 37.3.

Figure 37.3: Rotating Plot Methods Dialog

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 on the surface. The contour levels are spaced evenly within the range of the ZColor variable, or the range of the Z variable if no ZColor variable is specified.

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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 on the surface. The contour levels are spaced evenly within the range of the ZColor variable, or the range of the Z variable if no ZColor variable is specified.