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Categorical Data Analysis Using The SAS® System, 2nd Edition by Gary G. Koch, Charles S. Davis, Maura E. Stokes

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13.6. Obstetrical Pain Data: Advanced Modeling of Means

Sections 13.3 and 13.4 discussed analyses of means. This section is concerned with an advanced application of modeling means, and it includes a lengthy analysis of contrasts to fully investigate various effects and interactions.

The data displayed in Table 13.10 are from a multicenter randomized study of obstetrical-related pain for women who had recently delivered a baby (Koch et al. 1985). Investigators were interested in comparing four treatments: placebo, drug a, drug b, and a combined treatment of drug a and drug b. Each patient was classified as initially having some pain or a lot of pain. Then, a randomly assigned treatment was administered at the beginning of the study period and ...

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