Sleep Data

The data in the file sleep.dat consists of the various measures regarding sleep and other factors for a variety of mammals. The variables are:
  1. Species of animal
  2. Body weight (kg)
  3. Brain weight (g)
  4. Hours/day of non-dreaming sleep
  5. Hours/day of dreaming sleep
  6. Total hours/day of sleep
  7. Maximum life span in years
  8. Gestation time in days
  9. Predator Index, from 1 to 5 with 5 be most likely to be preyed upon
  10. Sleep exposure index, from 1 to 5 with 5 being the most exposed
  11. Overall danger index, from 1 to 5 with 5 being in the most danger

Missing values for all of the variables are represented by -999.0.
Source: http://lib.stat.cmu.edu/datasets/sleep
originally presented in Allison, Truett and Cicchetti, Domenic V. (1976), "Sleep in Mammals: Ecological and Constitutional Correlates", Science, November 12, vol. 194, pp. 732-734.