plot.gbm(x,
i.var = 1,
n.trees = x$n.trees,
continuous.resolution = 100,
return.grid = FALSE,
...)gbm.object fitted using a call to gbmgbm formula.
If length(i.var) is between 1 and 3 then plot.gbm produces the plots. Otherwise,
n.trees trees will be used.plot.gbm produces no graphics and only returns
the grid of evaluation points and their average predictions. This is useful for
customizing the graphics for special variable types or for dimensions greater
than 3.return.grid is true then plot.gbm produces no
graphics and only returns the grid of evaluation points and their average
predictions.plot.gbm produces low dimensional projections of the
gbm.object by integrating out the variables not included in the
i.var argument. The function selects a grid of points and uses the
weighted tree traversal method described in Friedman (2001) to do the
integration. Based on the variable types included in the projection,
plot.gbm selects an appropriate display choosing amongst line plots,
contour plots, and lattice plots. If the default graphics
are not sufficient the user may set return.grid=TRUE, store the result
of the function, and develop another graphic display more appropriate to the
particular example.gbm, gbm.object, plot