The data are from a multicenter randomized clinical trial to compare test and control treatments for the management of chronic pain, and they have had previous consideration in Stokes et al. (2000, chap. 13).
A data frame with 193 observations and 4 variables
a factor with levels
placebo for treatment
a factor with five levels
excel for pain status after treatment for 4 weeks
a factor with two levels
II for two centers
a factor with four levels
D for diagnoses
Stokes, M. E., Davis, C. S., and Koch, G. G. (2000), Categorical Data Analysis using the SAS System, Cary: SAS Publishing.
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