ratpup: ratpup data in Chapter 3
In WWGbook: Datasets and scripts for WWGbook.

Description Usage Format References Examples

The data come from a study in which 30 female rats were randomly assigned to receive one of three doses (High, Low, or Control) of an experimental compound.

1	data(ratpup)

A data frame with 322 observations on the following 6 variables.

pup.id: : Unique identifier for each rat pup
weight: : Birth weight of the rat pup (the dependent variable)
sex: : Sex of the rat pup (Male, Female)
litter: : Litter ID number
litsize: : Litter size (i.e., number of pups per litter)
treatment: : Dose level of the experimental compound assigned to the litter (High, Low, Control)

Pinheiro, J.C. and Bates, D.M., Mixed-effects models in S and S-PLUS, Springer-Verlag Inc., Berlin, New York, 2000.

West, B., Welch, K. & Galecki, A, Linear Mixed Models: A Practical Guide Using Statistical Software, Chapman Hall / CRC Press, first edition, 2006.

1	str(ratpup)

'data.frame':	322 obs. of  6 variables:
 $ pup.id   : int  1 2 3 4 5 6 7 8 9 10 ...
 $ weight   : num  6.6 7.4 7.15 7.24 7.1 6.04 6.98 7.05 6.95 6.29 ...
 $ sex      : Factor w/ 2 levels "Female","Male": 2 2 2 2 2 2 2 2 1 1 ...
 $ litter   : int  1 1 1 1 1 1 1 1 1 1 ...
 $ litsize  : int  12 12 12 12 12 12 12 12 12 12 ...
 $ treatment: Factor w/ 3 levels "Control","High",..: 1 1 1 1 1 1 1 1 1 1 ...