earth (version 2.3-0)

plot.earth.models: Compare "earth" models by plotting them.

Description

Compare earth models by plotting them.

Usage

plot.earth.models(x = stop("no 'x' arg"), which = c(1:2),
  caption = "", rlim = c(0,1), jitter = 0,
  col.grsq = discrete.plot.cols(length(x)),
  col.rsq = 0, col.npreds = 0, col.cum = NULL,
  col.vline = "grey", lty.vline = 3, col.legend = 1,
  legend.pos = NULL, legend.text = NULL, do.par = TRUE,
  main = "Model Comparison", ...)

Arguments

x

A list of one or more earth objects, or a single earth object. This is the only required argument. (This argument is called 'x' for consistency with

which

Which plots to plot: 1 model, 2 cumulative distribution of residuals. Default is 1:2, meaning both.

caption

Overall caption. Values: "string" string "" (default) no caption NULL generate a caption from the $call component of the earth objects.

rlim

Two element vector c(min,max) specifying min and max values on the y axis of the RSq/GRSq plot. Default is c(0,1).

The special value min=-1 means the minimum y axis value is the smallest GRSq or RSq,

jitter

Jitter applied to GRSq and RSq values to minimize over-plotting. Default is 0, meaning no jitter. A typical useful value is 0.01.

For all the col arguments below, 0 means do not plot the corresponding graph element. You can use vectors of colors for the col arguments.

col.grsq

Vector of colors for the GRSq plot. The default is discrete.plot.cols(length(x)) which is vector of distinguishable colors, the first three of which are also distinguishable on a monochrome printer. You can examine the colors

col.rsq

Vector of colors for the RSq plot. Default is 0, meaning no RSq plot.

col.npreds

Vector of colors for the "number of predictors" plot within the model selection plot.

Default is 0, meaning no "number of predictors" plot.

The special value NULL means borrow col.grsq (or col.rsq

col.cum

Vector of colors for the cumulative distribution plot. The special value NULL (default) means borrow col.grsq (or col.rsq if col.grsq is NULL).

col.vline

A vertical line is drawn for each object to show which model size was chosen for that object. The color of the line is col.vline. Default is "grey".

lty.vline

Line type of vertical lines (a vertical line is drawn to show the selected model for each object). Can be a vector. Default is 3.

col.legend

Default is 1, meaning draw a legend. Use 0 for no legend. The legend is drawn in the cumulative distribution graph, if that graph is plotted. Else the legend is drawn in the model comparison chart.

legend.pos

The special value NULL (default) means position the legend automatically. Else specify c(x,y) in user coordinates.

legend.text

Vector of strings to use as legend text. The special value NULL (default) means generate the legend text automatically from call$formula. The following settings are related to par() and are included so yo

do.par

Call par() for global settings as appropriate. Default is TRUE, which sets mfrow, mar=c(4,4,2,3), mgp=c(1.6,0.6,0), cex=0.7. Set to FALSE if you want to append figures to an existing plot.

main

Title of each plot. Default is NULL, meaning generate figure headings automatically.

...

Extra arguments passed to plotting functions.

See Also

earth, plot.earth, plot.earth.models, plotd, plotmo

Examples

data(ozone1)
a1 <- earth(O3 ~ .,          data = ozone1, degree = 2)
a2 <- earth(O3 ~ .-wind,     data = ozone1, degree = 2, nk = 31)
a3 <- earth(O3 ~ .-humidity, data = ozone1, degree = 2, nk = 31)
plot.earth.models(list(a1,a2,a3), rlim=c(.6,.8))