butterfat.df {s20x}

Butterfat Data

Description

This data gives the mean percentage of butterfat produced by different Canadian pure-bred diary cattle. There are five different breeds and two age groups, two years old and greater than five years old. For each combination of breed and age, there are measurements for 10 cows.

Format

A data frame with 100 observations on 3 variables.

[,1]	Butterfat	numeric	Mean percentage of butterfat per cow
[,2]	Breed	factor	Breed (ayrshire, canadian, guernesy, holst.fres, jersey)
[,3]	Age	factor	Age group (2yo, mature)

Source

A Handbook of Small Data Sets

References

Hand, D.J., Daly, F., Lunn, A.D., McConway, K.J. and Ostrowski, E. (1994). A Handbook of Small Data Sets. Boca Raton, Florida: Chapman and Hall/CRC.

Sokal, R.R. and Rohlf, F.J. (1981). Biometry, 2nd edition. San Francisco: W.H. Freeman, 368.