The ergoStool data frame has 36 rows and 3 columns.
Format
This data frame contains the following columns:
effort
a numeric vector giving the effort (Borg scale) required to
arise from a stool.
Type
a factor with levels
T1,
T2,
T3, and
T4 giving the stool type.
Subject
an ordered factor giving a unique identifier for the subject
in the experiment.
Details
Devore (2000) cites data from an article in Ergometrics (1993,
pp. 519-535) on “The Effects of a Pneumatic Stool and a One-Legged
Stool on Lower Limb Joint Load and Muscular Activity.”
Source
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S
and S-PLUS, Springer, New York. (Appendix A.9)
Devore, J. L. (2000), Probability and Statistics for
Engineering and the Sciences (5th ed), Duxbury, Boston, MA.
Examples
fm1 <-
lme(effort ~ Type, data = ergoStool, random = ~ 1 | Subject)
anova( fm1 )