Fitting Curves and Surfaces Using SAS Software - ISS - University of ...
Fitting Curves and Surfaces Using SAS Software - ISS - University of ...
Fitting Curves and Surfaces Using SAS Software - ISS - University of ...
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<strong>Fitting</strong> <strong>Curves</strong> <strong>and</strong> <strong>Surfaces</strong> <strong>Using</strong> <strong>SAS</strong> <strong>S<strong>of</strong>tware</strong><br />
Version 1.1 (February 2007)<br />
Example 5: <strong>Fitting</strong> a Generalised Additive Model using PROC GAM<br />
(i) Open the file gam.sas <strong>and</strong> execute the program by pressing F8.<br />
ods html<br />
file="c:\temp\sas\graph\so4b.htm";<br />
goptions reset=all device=activex;<br />
proc gam data=sasgraph.so4;<br />
model so4=spline(longitude)<br />
spline(latitude)<br />
score data=pred out=prediction3;<br />
run;<br />
ods html close;<br />
ods listing;<br />
The surface is much smoother than that produced by TPSPLINE. However, GAM uses much less cpu<br />
time than TPSPLINE. In this example, GAM ran in less than a fifth <strong>of</strong> the time taken by TPSPLINE. The<br />
contour b<strong>and</strong>s <strong>and</strong> the projected contour lines were added using the technique described in 1.2.3.<br />
Information Systems Services Page 18 <strong>of</strong> 22<br />
Version 1.1 (Feb 2007) tut125.doc
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