ggRandomForests (version 2.2.0)

plot.gg_error: Plot a gg_error object

Description

A plot of the cumulative OOB error rates of the random forest as a function of number of trees.

Usage

# S3 method for gg_error
plot(x, ...)

Value

ggplot object

Arguments

x

gg_error object created from a rfsrc object

...

extra arguments passed to ggplot functions

Details

The gg_error plot is used to track the convergence of the randomForest. This figure is a reproduction of the error plot from the plot.rfsrc function.

References

Breiman L. (2001). Random forests, Machine Learning, 45:5-32.

Ishwaran H. and Kogalur U.B. (2007). Random survival forests for R, Rnews, 7(2):25-31.

Ishwaran H. and Kogalur U.B. (2013). Random Forests for Survival, Regression and Classification (RF-SRC), R package version 1.4.

See Also

gg_error rfsrc plot.rfsrc

Examples

if (FALSE) {
## Examples from RFSRC package...
## ------------------------------------------------------------
## classification example
## ------------------------------------------------------------
## ------------- iris data
## You can build a randomForest
# rfsrc_iris <- rfsrc(Species ~ ., data = iris)
# ... or load a cached randomForestSRC object
data(rfsrc_iris, package="ggRandomForests")

# Get a data.frame containing error rates
gg_dta<- gg_error(rfsrc_iris)

# Plot the gg_error object
plot(gg_dta)

## ------------------------------------------------------------
## Regression example
## ------------------------------------------------------------
## ------------- airq data
# rfsrc_airq <- rfsrc(Ozone ~ ., data = airquality, na.action = "na.impute")
# ... or load a cached randomForestSRC object
data(rfsrc_airq, package="ggRandomForests")

# Get a data.frame containing error rates
gg_dta<- gg_error(rfsrc_airq)

# Plot the gg_error object
plot(gg_dta)

## ------------- Boston data
data(rfsrc_boston, package="ggRandomForests")

# Get a data.frame containing error rates
gg_dta<- gg_error(rfsrc_boston)

# Plot the gg_error object
plot(gg_dta)

## ------------- mtcars data
data(rfsrc_mtcars, package="ggRandomForests")

# Get a data.frame containing error rates
gg_dta<- gg_error(rfsrc_mtcars)

# Plot the gg_error object
plot(gg_dta)

## ------------------------------------------------------------
## Survival example
## ------------------------------------------------------------
## ------------- veteran data
## randomized trial of two treatment regimens for lung cancer
# data(veteran, package = "randomForestSRC")
# rfsrc_veteran <- rfsrc(Surv(time, status) ~ ., data = veteran, ntree = 100)

# Load a cached randomForestSRC object
data(rfsrc_veteran, package="ggRandomForests")

gg_dta <- gg_error(rfsrc_veteran)
plot(gg_dta)

## ------------- pbc data
# Load a cached randomForestSRC object
data(rfsrc_pbc, package="ggRandomForests")

gg_dta <- gg_error(rfsrc_pbc)
plot(gg_dta)
}