The data concern the sizes of Egyptian skulls over time, from Thomson and Randall-MacIver [1905]. There are 30 skulls from each of five time periods, so that n = 150 all together.
skullsA double matrix with 150 observations on the following 5 variables.
Maximum length in millimeters
Basibregmatic Height in millimeters
Basialveolar Length in millimeters
Nasal Height in millimeters
Time groupings
A. Thomson and R. Randall-MacIver. Ancient Races of the Thebaid. Oxford University Press, 1905.