| % File src/library/datasets/man/HairEyeColor.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2018 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{HairEyeColor} |
| \docType{data} |
| \alias{HairEyeColor} |
| \title{Hair and Eye Color of Statistics Students} |
| \description{ |
| Distribution of hair and eye color and sex in 592 statistics students. |
| } |
| \usage{HairEyeColor} |
| \format{ |
| A 3-dimensional array resulting from cross-tabulating 592 observations |
| on 3 variables. The variables and their levels are as follows: |
| |
| \tabular{rll}{ |
| No \tab Name \tab Levels \cr |
| 1 \tab Hair \tab Black, Brown, Red, Blond \cr |
| 2 \tab Eye \tab Brown, Blue, Hazel, Green \cr |
| 3 \tab Sex \tab Male, Female |
| } |
| } |
| \details{ |
| The Hair \eqn{\times}{x} Eye table comes from a survey of students at |
| the University of Delaware reported by Snee (1974). The split by |
| \code{Sex} was added by Friendly (1992a) for didactic purposes. |
| |
| This data set is useful for illustrating various techniques for the |
| analysis of contingency tables, such as the standard chi-squared test |
| or, more generally, log-linear modelling, and graphical methods such |
| as mosaic plots, sieve diagrams or association plots. |
| } |
| \source{ |
| \url{http://euclid.psych.yorku.ca/ftp/sas/vcd/catdata/haireye.sas} |
| |
| Snee (1974) gives the two-way table aggregated over \code{Sex}. The |
| \code{Sex} split of the \sQuote{Brown hair, Brown eye} cell was |
| changed to agree with that used by Friendly (2000). |
| } |
| \references{ |
| Snee, R. D. (1974). |
| Graphical display of two-way contingency tables. |
| \emph{The American Statistician}, \bold{28}, 9--12. |
| \doi{10.2307/2683520}. |
| |
| Friendly, M. (1992a). |
| Graphical methods for categorical data. |
| \emph{SAS User Group International Conference Proceedings}, \bold{17}, |
| 190--200. |
| \url{http://www.math.yorku.ca/SCS/sugi/sugi17-paper.html} |
| |
| Friendly, M. (1992b). |
| Mosaic displays for loglinear models. |
| \emph{Proceedings of the Statistical Graphics Section}, |
| American Statistical Association, pp.\sspace{}61--68. |
| \url{http://www.math.yorku.ca/SCS/Papers/asa92.html} |
| |
| Friendly, M. (2000). |
| \emph{Visualizing Categorical Data}. |
| SAS Institute, ISBN 1-58025-660-0. |
| } |
| \seealso{ |
| \code{\link{chisq.test}}, |
| \code{\link{loglin}}, |
| \code{\link{mosaicplot}} |
| } |
| \examples{ |
| require(graphics) |
| ## Full mosaic |
| mosaicplot(HairEyeColor) |
| ## Aggregate over sex (as in Snee's original data) |
| x <- apply(HairEyeColor, c(1, 2), sum) |
| x |
| mosaicplot(x, main = "Relation between hair and eye color") |
| } |
| \keyword{datasets} |