
Inspecting and Exploring Data 111
0.002
0.004
0.004
0.004
0.006
0.006
0.008
0.008
0.008
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0.008
0.01
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0.016
Figure 4.20. Left: New Zealand trees data. Right: contour plot of kernel estimate of intensity.
of smoothing parameter will be discussed elsewhere. (See Section 6.5. 1.) We have also chosen to
display the re sult as a contour plot. The result is shown in the right panel of Fig ure 4.20.
A striking feature of the intensity estimate is that it has a steep slope at the top right-hand corner
of the study region. Looking at the plot of the point pattern itself, we ca n see a cluster of trees at the
top right. Y