The data are from a randomized clinical trial to compare a test treatment to placebo for a seborrheic dermatitis, and listings of the data appear in Ramaswamy, Koch, and Amara (1997). The variables are as follows:
data(sebor)A data frame with 167 observations and 8 variables.
centera factor vector for eight centers
treata factor with levels placebo and test for placebo and test treatments, resectively
score1a numeric vector for patient global scores for the face according to 6 categories (0 = cleared, 1 = excellent improvement, 2 = moderate improvement, 3 = slight improvement, 4 = no change, 5 = exacerbation)
score2a numeric vector for patient global scores for the scalp with same categories as score1
score3a numeric vector for patient global scores for the chest with same categories as score1
severity1a numeric vector for the baseline desease severity for the face according to 3 categories (1 = mild, 2 = moderate, 3 = severe)
severity2a numeric vector for the baseline desease severity for the scalp with same categories as severity1
severity3a numeric vector for the baseline desease severity for the chest with same categories as severity1
Ramaswamy R, Koch G, Amara I (1997). "Application of rank analysis of covariance methods to analysis of multiple anatomical regions with treatment for seborrheic dermatitis." Journal of Biopharmaceutical Statistics, 7(3), 403--416.