discrimination.plot {verification} | R Documentation

## Discrimination plot

### Description

This function creates a plot of discrimination plots (overlay histograms). In the context of verification, this is often used to compare the distribution of event and no-event forecasts. This may be useful in comparing any set of observations. By default, boxplots of groups appear as upper marginal plots. These may be surpressed.

### Usage

    discrimination.plot(group.id, value, breaks = 11, main =
    "Discrimination Plot", xlim = NULL, ylim = NULL,  legend =
    FALSE, leg.txt = paste("Model", unique(group.id) ),   marginal = TRUE, cols =
    seq(2, length(unique(group.id)) + 1), xlab = "Forecast",  ... )

### Arguments

`group.id` | A vector identifying groups. A histogram is created for each unique value.
`value` | A vector of values corresponding to the group.id vector used to create the histograms
`breaks` | Number of breaks in the x-axis of the histogram. The range of values is taken to be the range of prediction values.
`main` | Title for plot.
`xlim` | Range of histogram - x axis - main plot coordinates.
`ylim` | Range of histogram - y axis - main plot coordinates.
`legend` | Should there be a legend? Default = FALSE
`leg.txt` | Legend text. If FALSE or if a marginal plot is created, no legend is added.
`cols` | A vector showing the colors to be used in the histograms and in the marginal boxplots
`marginal` | Should a boxplots be placed in the top margin? Defaults to TRUE
`xlab` | Label of the x-axis on the main plot.
`...` | Additional plotting options.

### Author(s)

Matt Pocernich <pocernic@rap.ucar.edu>

### Examples

     #  A sample forecast.

    data(disc.dat)
    discrimination.plot(disc.dat$group.id, disc.dat$frcst, main = "Default
    Plot")

    discrimination.plot(disc.dat$group.id, disc.dat$frcst,
    main = "New Labels", cex = 1.2, leg.txt = c("Low", "Med", "High" ) )

    discrimination.plot(disc.dat$group.id, disc.dat$frcst, main = "Without Marginal Plots ", marginal = FALSE)

[Package verification version 1.20 Index]