Generate a pixel image plot, or a perspective plot,
of a leverage function that has been computed by leverage.ppm.
# S3 method for leverage.ppm
plot(x, …, showcut=TRUE, col.cut=par("fg"),
args.contour=list(),
multiplot=TRUE) # S3 method for leverage.ppm
persp(x, …, main)
Leverage function (object of class "leverage.ppm") computed by
leverage.ppm.
Logical. If TRUE, a contour line is plotted at the
level equal to the theoretical mean of the leverage.
Optional colour for the contour line.
Optional list of arguments passed to
contour.default to control the
plotting of the contour line.
Logical value indicating whether it is permissible to display several plot panels.
Optional main title.
These functions are the plot and persp methods
for objects of class "leverage.ppm".
Such objects are computed by the command leverage.ppm.
The plot method displays the leverage function
as a colour pixel image using plot.im,
and draws a single contour line at the mean leverage value
using contour.default.
Use the argument clipwin to restrict the plot to a subset
of the full data.
The persp method displays the leverage function as a surface
in perspective view, using persp.im.
Baddeley, A., Chang, Y.M. and Song, Y. (2013) Leverage and influence diagnostics for spatial point process models. Scandinavian Journal of Statistics 40, 86--104.
# NOT RUN {
X <- rpoispp(function(x,y) { exp(3+3*x) })
fit <- ppm(X ~x+y)
lef <- leverage(fit)
plot(lef)
persp(lef)
# }
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