caret: histogram.train – R documentation

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histogram.train

Lattice functions for plotting resampling results

Description

A set of lattice functions are provided to plot the resampled performance estimates (e.g. classification accuracy, RMSE) over tuning parameters (if any).

Usage

## S3 method for class 'train'
histogram(x, data = NULL, metric = x$metric, ...)

Arguments

`x`	An object produced by `train`
`data`	This argument is not used
`metric`	A character string specifying the single performance metric that will be plotted
`...`	arguments to pass to either `histogram`, `densityplot`, `xyplot` or `stripplot`

Details

By default, only the resampling results for the optimal model are saved in the train object. The function trainControl can be used to save all the results (see the example below).

If leave-one-out or out-of-bag resampling was specified, plots cannot be produced (see the method argument of trainControl)

For xyplot and stripplot, the tuning parameter with the most unique values will be plotted on the x-axis. The remaining parameters (if any) will be used as conditioning variables. For densityplot and histogram, all tuning parameters are used for conditioning.

Using horizontal = FALSE in stripplot works.

Value

A lattice plot object

Author(s)

Max Kuhn

Examples

## Not run: 

library(mlbench)
data(BostonHousing)

library(rpart)
rpartFit <- train(medv ~ .,
                  data = BostonHousing,
                  "rpart", 
                  tuneLength = 9,
                  trControl = trainControl(
                    method = "boot", 
                    returnResamp = "all"))

densityplot(rpartFit,
            adjust = 1.25)

xyplot(rpartFit,
       metric = "Rsquared",
       type = c("p", "a"))

stripplot(rpartFit,
          horizontal = FALSE,
          jitter = TRUE)


## End(Not run)

caret

Classification and Regression Training

v6.0-86

GPL (>= 2)

Authors

Max Kuhn [aut, cre], Jed Wing [ctb], Steve Weston [ctb], Andre Williams [ctb], Chris Keefer [ctb], Allan Engelhardt [ctb], Tony Cooper [ctb], Zachary Mayer [ctb], Brenton Kenkel [ctb], R Core Team [ctb], Michael Benesty [ctb], Reynald Lescarbeau [ctb], Andrew Ziem [ctb], Luca Scrucca [ctb], Yuan Tang [ctb], Can Candan [ctb], Tyler Hunt [ctb]

Initial release