R: Hair and Eye Color of Statistics Students

HairEyeColor {datasets} | R Documentation

## 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:

No | Name | Levels
1 | Hair | Black, Brown, Red, Blond
2 | Eye | Brown, Blue, Hazel, Green
3 | Sex | Male, Female

### Details

The Hair x Eye table comes rom a survey of students at the University of Delaware reported by Snee (1974). The split by `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

http://euclid.psych.yorku.ca/ftp/sas/vcd/catdata/haireye.sas

Snee (1974) gives the two-way table aggregated over `Sex`. The Sex split of the ‘Brown hair, Brown eye’ cell was changed in R 2.6.0 to agree with that used by Friendly (2000).

### References

Snee, R. D. (1974) Graphical display of two-way contingency tables. The American Statistician, 28, 9–12.

Friendly, M. (1992a) Graphical methods for categorical data. SAS User Group International Conference Proceedings, 17, 190–200. http://www.math.yorku.ca/SCS/sugi/sugi17-paper.html

Friendly, M. (1992b) Mosaic displays for loglinear models. Proceedings of the Statistical Graphics Section, American Statistical Association, pp. 61–68. http://www.math.yorku.ca/SCS/Papers/asa92.html

Friendly, M. (2000) Visualizing Categorical Data. SAS Institute, ISBN 1-58025-660-0.

### See Also

`chisq.test`, `loglin`, `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")

[Package datasets version 2.6.2 Index]