\name{Mammograms}
\alias{Mammograms}
\docType{data}

\title{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", \emph{Radiology}, \bold{228}, 303-308, Table A1
}

%\references{
%%%  ~~ possibly secondary sources and usages ~~
%}
\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))
}
\keyword{datasets}
\concept{observer agreement}
\concept{ordinal variables}
