heads {calibrate} | R Documentation |

## Dimensions of heads of first and second sons for 25 families

### Description

Variables X1 and X2 are the head length and head breadth of the first son and
Y1 and Y2 are the same variables for the second son.

### Usage

data(heads)

### Format

A data frame containing 25 observations.

### Source

Mardia, 1979, p. 121

### References

Frets, G. P. (1921) *Heredity of head form in man*,
Genetica 3, pp. 193-384.

Mardia, K. V. and Kent, J. T. and Bibby, J. M. (1979) *Multivariate Analysis*.
Academic Press London.

Anderson, T. W. (1984) *An Introduction to Multivariate Statistical Analysis*.
New York: John Wiley, Second edition.

[Package

*calibrate* version 1.7.7

Index]