On this Picostat.com statistics page, you will find information about the frets data set which pertains to Head Dimensions in Brothers. The frets data set is found in the boot R package. You can load the frets data set in R by issuing the following command at the console data("frets"). This will load the data into a variable called frets. If R says the frets data set is not found, you can try installing the package by issuing this command install.packages("boot") and then attempt to reload the data. If you need to download R, you can go to the R project website. You can download a CSV (comma separated values) version of the frets R data set. The size of this file is about 420 bytes.
Head Dimensions in Brothers
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.
This data frame contains the following columns:
The head length of the eldest son.
The head breadth of the eldest son.
The head length of the second son.
The head breadth of the second son.
The data were obtained from
Frets, G.P. (1921) Heredity of head form in man. Genetica, 3,
Davison, A.C. and Hinkley, D.V. (1997)
Bootstrap Methods and Their Application. Cambridge University Press.
Whittaker, J. (1990) Graphical Models in Applied Multivariate Statistics.
Dataset imported from https://www.r-project.org.