HairEyeColor | 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 `\times`

Eye table comes from 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://www.datavis.ca/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 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.
doi:10.2307/2683520.

Friendly, M. (1992a).
Graphical methods for categorical data.
*SAS User Group International Conference Proceedings*, **17**,
190–200.
http://datavis.ca/papers/sugi/sugi17.pdf

Friendly, M. (1992b).
Mosaic displays for loglinear models.
*Proceedings of the Statistical Graphics Section*,
American Statistical Association, pp. 61–68.
http://www.datavis.ca/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")
```