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simple linear model.Shell and Width are selected as the best pair of linear predictors
in both leaf nodes. Figure
.
shows shaded contour plots of the fitted functions and
data points. Clearly, the mussels from Sites
and
tend to have greater muscle mass
than those from Sites
,
, and
.
Since Site is an important predictor in the GUIDE models, we redraw the SIR
plot using different symbols to indicate site information in panel a of Fig.
.
. he
banana-shaped plot is seen to be an artifact caused by combining the sites; the data
F i g u r e
.
.
Shaded contour plots of fitted functions and data points for the piecewise best two-variable
linear model on the right side of Fig.
.
Figure
.
.
Musclevs.SIR
bysiteandbythenodesofthetreeinFig.
.
a