This dataset was used by Littell (2002) to demonstrate repeated measures analyses. The effect of two asthma drugs and a placebo were measured on 24 asthmatic patients. Each patient was randomly given each drug using an approach to minimize carry-over effects. Forced expiratory volume (FEV1), the volume of air that can be expired after taking a deep breath in one second, was measured. FEV1 was measured hourly for eight hours following application of the drug. A baseline measure of FEV1 was also taken 11 hours before application of the treatment.
data(asthma)The dataframe has 11 columns:
The subjects (there were 24 patients).
A numerical variable; the baseline forced expiratory volume.
Forced expiratory volume at 11 hours.
Forced expiratory volume at 12 hours.
Forced expiratory volume at 13 hours.
Forced expiratory volume at 14 hours.
Forced expiratory volume at 15 hours.
Forced expiratory volume at 16 hours.
Forced expiratory volume at 17 hours.
Forced expiratory volume at 18 hours.
A factor with three levels "a" = a standard drug treatment, "c" = the drug under development, and "p" = a placebo.