asthma: Asthma repeated measures dataset from Littell et al. (2002)
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asthma

R Documentation

Asthma repeated measures dataset from Littell et al. (2002)

Description

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.

Usage

data(asthma)

Format

The dataframe has 11 columns:

PATIENT: The subjects (there were 24 patients).
BASEFEV1: A numerical variable; the baseline forced expiratory volume.
FEV11H: Forced expiratory volume at 11 hours.
FEV12H: Forced expiratory volume at 12 hours.
FEV13H: Forced expiratory volume at 13 hours.
FEV14H: Forced expiratory volume at 14 hours.
FEV15H: Forced expiratory volume at 15 hours.
FEV16H: Forced expiratory volume at 16 hours.
FEV17H: Forced expiratory volume at 17 hours.
FEV18H: Forced expiratory volume at 18 hours.
DRUG: A factor with three levels "a" = a standard drug treatment, "c" = the drug under development, and "p" = a placebo.