pig.weights data frame has 9 repeated
weight measures on 48 pigs.
This data frame contains the following columns:
identification number of pig.
number of weeks since measurements commenced.
bodyweight of pig "id.num" after "num.weeks" weeks.
Diggle, P.J., Heagerty, P., Liang, K.-Y. and Zeger, S.L. (2002). Analysis of Longitudinal Data, Second Edition, Oxord: Oxford University Press.
Ruppert, D., Wand, M.P. and Carroll, R.J. (2003)
Semiparametric Regression Cambridge University Press.
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