Brain {BSDA}

Brain weight versus body weight of 28 animals

Description

Data for Exercises 2.15, 2.44, 2.58 and Examples 2.3 and 2.20

Usage

Brain

Format

A data frame/tibble with 28 observations on three variables

species

a factor with levels African elephant, Asian Elephant, Brachiosaurus, Cat, Chimpanzee, Cow, Diplodocus, Donkey, Giraffe, Goat, Gorilla, Gray wolf, Guinea Pig, Hamster, Horse, Human, Jaguar, Kangaroo, Mole, Mouse, Mt Beaver, Pig, Potar monkey, Rabbit, Rat, Rhesus monkey, Sheep, and Triceratops

bodyweight

body weight (in kg)

brainweight

brain weight (in g)

Source

P. Rousseeuw and A. Leroy, Robust Regression and Outlier Detection (New York: Wiley, 1987).

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples

plot(log(brainweight) ~ log(bodyweight), data = Brain, 
     pch = 19, col = "blue", main = "Example 2.3")
mod <- lm(log(brainweight) ~ log(bodyweight), data = Brain)      
abline(mod, lty = "dashed", col = "blue")