WWGbook (version 1.0.2)

ratpup: ratpup data in Chapter 3

Description

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.

Usage

data(ratpup)

Format

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)

References

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.

Examples

# NOT RUN {
str(ratpup)
# }