frets {SMPracticals}

Head Dimensions in Brothers

Description

The 'frets' data frame has 25 rows and 4 columns.

The data consist of measurements of the length and breadth of the heads of pairs of adult brothers in 25 randomly sampled families. All measurements are expressed in millimetres.

Usage

data(frets)

Format

This data frame contains the following columns:

l1

The head length of the eldest son.

b1

The head breadth of the eldest son.

l2

The head length of the second son.

b2

The head breadth of the second son.

Source

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

References

Whittaker, J. (1990) Graphical Models in Applied Multivariate Statistics. John Wiley.

Examples

data(frets)
## maybe str(frets) ; plot(frets) ...