The ergoStool data frame has 36 rows and 3 columns.
This data frame contains the following columns:
a numeric vector giving the effort (Borg scale) required to arise from a stool.
a factor with levels
T1,
T2,
T3, and
T4 giving the stool type.
an ordered factor giving a unique identifier for the subject in the experiment.
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.''