Male and female macaque skull data. 7 landmarks in 3 dimensions, 18 individuals (9 males, 9 females)
macaques$x: An array of dimension \(7 \times 3 \times 18\)
macaques$group: A factor indicating the sex ('m' for male and 'f' for female)
In an investigation into sex differences in the crania of a species of Macaca fascicularis (a type of monkey), random samples of 9 male and 9 female skulls were obtained by Paul O’Higgins (Hull-York Medical School) (Dryden and Mardia 1993). A subset of seven anatomical landmarks was located on each cranium and the three-dimensional (3D) coordinates of each point were recorded.
Dryden, I.L. and Mardia, K.V. (1998). Statistical Shape Analysis, Wiley, Chichester.
Dryden, I. L. and Mardia, K. V. (1993). Multivariate shape analysis. Sankhya Series A, 55, 460-480.