
RF SPREAD PLOTName:
The vertical spread of the residuals compared to the vertical spread of the fitted values gives an indication of how much of the variation is explained by the fit. Dataplot assumes that some type of fit has already been performed and that the predicted values are stored in the internal variable PRED and the residuals are stored in the internal variable RES. If you want to generate the rf spread plot for variables that are not automatically stored on PRED and RES, then simply copy the desired variables into PRED and RES before entering the RF SPREAD PLOT (e.g., LET PRED = Y).
where the <SUBSET/EXCEPT/FOR qualification> is optional.
RF SPREAD PLOT
LOWESS Y X
SPLINE FIT Y X
 
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Date created: 6/5/2001 