R: Plot threshold vs. performance(s) for 2-class classification...

plotThreshVsPerf {mlr} | R Documentation

## Plot threshold vs. performance(s) for 2-class classification using ggplot2.

### Description

Plots threshold vs. performance(s) data that has been generated with generateThreshVsPerfData.

### Usage

    plotThreshVsPerf(obj, measures = obj$measures, facet = "measure",
      mark.th = NA_real_, pretty.names = TRUE, facet.wrap.nrow = NULL,
      facet.wrap.ncol = NULL)

### Arguments

`obj` | (ThreshVsPerfData) Result of generateThreshVsPerfData.
`measures` | (Measure | list of Measure) Performance measure(s) to plot. Must be a subset of those used in generateThreshVsPerfData. Default is all the measures stored in `obj` generated by generateThreshVsPerfData.
`facet` | (`character(1)`) Selects “measure” or “learner” to be the facetting variable. The variable mapped to `facet` must have more than one unique value, otherwise it will be ignored. The variable not chosen is mapped to color if it has more than one unique value. The default is “measure”.
`mark.th` | (`numeric(1)`) Mark given threshold with vertical line? Default is `NA` which means not to do it.
`pretty.names` | (`logical(1)`) Whether to use the Measure name instead of the id in the plot. Default is `TRUE`.
`facet.wrap.nrow, facet.wrap.ncol` | (integer) Number of rows and columns for facetting. Default for both is `NULL`. In this case ggplot's `facet_wrap` will choose the layout itself.

### Value

ggplot2 plot object.

### See Also

Other plot: `createSpatialResamplingPlots`, `plotBMRBoxplots`, `plotBMRRanksAsBarChart`, `plotBMRSummary`, `plotCalibration`, `plotCritDifferences`, `plotLearningCurve`, `plotPartialDependence`, `plotROCCurves`, `plotResiduals`

Other thresh_vs_perf: `generateThreshVsPerfData`, `plotROCCurves`

### Examples

    lrn = makeLearner("classif.rpart", predict.type = "prob")
    mod = train(lrn, sonar.task)
    pred = predict(mod, sonar.task)
    pvs = generateThreshVsPerfData(pred, list(acc, setAggregation(acc, train.mean)))
    plotThreshVsPerf(pvs)

[Package mlr version 2.13 Index]