An experiment was conducted to compare the energy requirements of three physical activities: running, walking and bicycle riding. Eight subjects were asked to run, walk and bicycle a measured distance, and the number of kilocalories expended per kilometre was measured for each subject during each activity. The activities are run in random order with time for recovery between activities. Each activity was monitored exactly once for each individual.
activity.df
A data.frame with 24 rows and 3 columns:
a subject ID.
running, walking, riding.
energy expended during activity, in kilocalories (Cal)