Consider the data from Koch and Edwards (1988) displayed in Table 4.1. The information comes from a randomized, double-blind clinical trial investigating a new treatment for rheumatoid arthritis. Investigators compared the new treatment with a placebo; the response measured was whether there was no, some, or marked improvement in the symptoms of rheumatoid arthritis.
These data comprise a set of two 2 × 3 tables. There is interest in the association between treatment and degree of improvement, adjusting for gender effects. Degree of ...