Source: Unknown - Date unknown
This dataset contains 3 more features compared to version 1 of the same dataset.
Data from which conclusions were drawn in the article "Sleep in
Mammals: Ecological and Constitutional Correlates" by Allison, T. and
Cicchetti, D. (1976), _Science_, November 12, vol. 194, pp. 732-734.
Includes brain and body weight, life span, gestation time, time
sleeping, and predation and danger indices for 62 mammals.
Variables below (from left to right) for Mammals Data Set:
species of animal
body weight in kg
brain weight in g
slow wave ("nondreaming") sleep (hrs/day)
paradoxical ("dreaming") sleep (hrs/day)
total sleep (hrs/day) (sum of slow wave and paradoxical sleep)
maximum life span (years)
gestation time (days)
predation index (1-5)
1 = minimum (least likely to be preyed upon)
5 = maximum (most likely to be preyed upon)
sleep exposure index (1-5)
1 = least exposed (e.g. animal sleeps in a
5 = most exposed
overall danger index (1-5)
(based on the above two indices and other information)
1 = least danger (from other animals)
5 = most danger (from other animals)
For more details, see
Allison, Truett and Cicchetti, Domenic V. (1976), "Sleep in Mammals:
Ecological and Constitutional Correlates", _Science_, November 12,
vol. 194, pp. 732-734.
The above data set can be freely used for non-commercial purposes and
can be freely distributed (permission in writing obtained from Dr.
Submitted by Roger Johnson
Information about the dataset
CLASSINDEX: none specific