"Data from StatLib (ftp stat.cmu.edu/datasets) 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 well-protected den) 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) Note: Missing values denoted by -999.0 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. Truett Allison). Submitted by Roger Johnson rwjohnso@silver.sdsmt.edu Total sleep treated as the class attribute. Attributes for slow wave and paradoxical sleep have been deleted. (The animal's name has also been deleted.) " "0" "sleep" 6654 1 3.385 0.92 2547 10.55 0.023 160 3.3 52.16 0.425 465 0.55 187.1 0.075 3 0.785 0.2 1.41 60 529 27.66 0.12 207 85 36.33 0.101 1.04 521 100 35 0.005 0.01 62 0.122 1.35 0.023 0.048 1.7 3.5 250 0.48 10 1.62 192 2.5 4.288 0.28 4.235 6.8 0.75 3.6 14.83 55.5 1.4 0.06 0.9 2 0.104 4.19 3.5 4.05 3.3 8.3 12.5 16.5 3.9 9.8 19.7 6.2 14.5 9.7 12.5 3.9 10.3 3.1 8.4 8.6 10.7 10.7 6.1 18.1 nan 3.8 14.4 12 6.2 13 13.8 8.2 2.9 10.8 nan 9.1 19.9 8 10.6 11.2 13.2 12.8 19.4 17.4 nan 17 10.9 13.7 8.4 8.4 12.5 13.2 9.8 9.6 6.6 5.4 2.6 3.8 11 10.3 13.3 5.4 15.8 10.3 19.4 nan 5712 6 44 5 4603 179 0 169 25 440 6 423 2 419 1 25 3 5 17 81 680 115 1 406 325 119 4 5 655 157 56 0 0 1320 3 8 0 0 6 10 490 15 115 11 180 12 39 1 50 179 12 21 98 175 12 1 2 12 2 58 3 17 38 4 14 -2147483648 69 27 19 30 28 50 7 30 -2147483648 40 3 50 6 10 34 7 28 20 3 39 41 16 9 7 46 22 16 2 24 100 -2147483648 -2147483648 3 2 5 6 23 12 20 13 27 18 13 4 9 29 7 6 17 20 12 3 4 7 2 24 3 13 645 42 60 25 624 180 35 392 63 230 112 281 -2147483648 365 42 28 42 120 -2147483648 -2147483648 400 148 16 252 310 63 28 68 336 100 33 21 50 267 30 45 19 30 12 120 440 140 170 17 115 31 63 21 52 164 225 225 150 151 90 -2147483648 60 200 46 210 14 38 3 3 1 5 3 4 1 4 1 1 5 5 2 5 1 2 2 2 1 1 5 5 3 1 1 1 5 5 5 1 3 5 1 1 2 3 4 4 2 2 5 2 4 2 4 5 2 3 1 2 2 3 5 5 2 3 2 3 3 4 2 3 5 1 1 2 5 4 1 5 2 1 4 5 1 5 1 2 2 2 2 1 5 5 1 4 3 1 1 3 5 1 5 2 1 1 1 1 1 1 1 1 5 2 4 1 4 5 2 1 1 3 2 2 5 5 2 1 1 1 2 3 1 1 3 3 1 3 4 4 1 4 1 1 4 5 2 5 1 2 2 2 1 1 5 5 2 1 1 1 3 4 5 1 4 4 1 1 1 3 3 3 1 1 5 2 4 2 4 5 2 3 1 2 2 3 5 5 2 2 2 3 2 4 1 1 "body_weight" "brain_weight" "max_life_span" "gestation_time" "predation_index" "sleep_exposure_index" "danger_index" "total_sleep" "double0" "int1" "double2" "numeric" "numeric" "numeric" "numeric" "numeric" "numeric" "numeric" "numeric"