Pig weight data

Description

The pig.weights data frame has 9 repeated weight measures on 48 pigs.

Usage

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Format

This data frame contains the following columns:

id.num

identification number of pig.

num.weeks

number of weeks since measurements commenced.

weight

bodyweight of pig "id.num" after "num.weeks" weeks.

Source

Diggle, P.J., Heagerty, P., Liang, K.-Y. and Zeger, S.L. (2002). Analysis of Longitudinal Data, Second Edition, Oxord: Oxford University Press.

References

Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
Semiparametric Regression Cambridge University Press.
http://stat.tamu.edu/~carroll/semiregbook/

Examples

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library(SemiPar)
data(pig.weights)
library(lattice)
xyplot(weight~num.weeks,data=pig.weights,groups=id.num,type="b")