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

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.