8.1. Introduction
The previous chapters discussed the investigation of statistical association, primarily by testing the hypothesis of no association between a set of groups and outcomes for a response with adjustment for a set of strata. Recall that Mantel-Haenszel strategies produced tests for specific alternatives to no association: general association, location shifts for means, and linear trends. This chapter shifts the focus to statistical models, methods aimed at describing the nature of the association in terms of a parsimonious number of parameters. Besides describing the variation in the data, statistical modeling allows you to address questions about association in terms of hypotheses concerning model parameters.
If certain realistic ...
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