R: Mammogram Ratings

Mammograms {vcdExtra} | R Documentation

## Mammogram Ratings

### Description

Kundel & Polansky (2003) give (possibly contrived) data on a set of 110 mammograms rated by two readers.

### Usage

    data(Mammograms)

### Format

A frequency table in matrix form. The format is: num [1:4, 1:4] 34 6 2 0 10 8 5 1 2 8 ... - attr(*, "dimnames")=List of 2 ..$ Reader2: chr [1:4] "Absent" "Minimal" "Moderate" "Severe" ..$ Reader1: chr [1:4] "Absent" "Minimal" "Moderate" "Severe"

### Source

Kundel, H. L. & Polansky, M. (2003), "Measurement of Observer Agreement", Radiology, 228, 303-308, Table A1

### Examples

    data(Mammograms)
    B <- agreementplot(Mammograms, main="Mammogram ratings")
    # agreement measures
    B
    Kappa(Mammograms)

    ## other displays
    mosaic(Mammograms, shade=TRUE)

    sieve(Mammograms, pop = FALSE, shade = TRUE)
    labeling_cells(text = Mammograms, gp_text = gpar(fontface = 2, cex=1.75))(as.table(Mammograms))

[Package vcdExtra version 0.7-1 Index]