butterfat {GLMsData} | R Documentation |
Butterfat and dairy cattle
Description
The average butterfat content for dairy cattle
Usage
data(butterfat)
Format
A data frame with 100 observations on the following 3 variables.
Butterfat
the average butterfat percentage; a numeric vector
Breed
the cattle breed; a factor with levels
Ayrshire
,Canadian
,Guernsey
,Holstein-Fresian
andJersey
Age
the age of the cow; a factor with levels
2year
andMature
Details
The data give the average butterfat content (percentages) for random samples of twenty cows (ten two-year old and ten mature (greater than four years old)) from each of five breeds. The data are from Canadian records of pure-bred dairy cattle.
Source
D. J. Hand, F. Daly, A. D. Lunn, K. J. McConway, and E. Ostrowski (1994) A Handbook of Small Data Sets, London: Chapman and Hall. Dataset 23.
R. R. Sokal and F. J. Rohlf (1981) Biometry, 2nd edition, San Fransisco: WH Freeman.
Examples
data(butterfat)
summary(butterfat)