frets {SMPracticals} | R Documentation |
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.
data(frets)
This data frame contains the following columns:
Frets, G.P. (1921) Heredity of head form in man. Genetica, 3, 193.
Whittaker, J. (1990) Graphical Models in Applied Multivariate Statistics. John Wiley.
data(frets) ## maybe str(frets) ; plot(frets) ...