Categorical Data Analysis Using The SAS® System, 2nd Edition

8.2. Dichotomous Explanatory Variables

8.2.1. Logistic Model

Table 8.1 displays the coronary artery disease data that were analyzed in Chapter 3, “Sets of 2 × 2 Tables.” Recall that the study population consists of people who visited a clinic on a walk-in basis and required a catheterization. The response, presence of coronary artery disease (CA), is dichotomous, as are the explanatory variables, sex and ECG. These data were analyzed in Section 3.3.2 with Mantel-Haenszel methods; also, odds ratios and the common odds ratio were computed. Recall that ECG was clearly associated with disease status, adjusted for gender.

Table 8.1. Coronary Artery Disease Data

Sex	ECG	Disease	No Disease	Total
Female	< 0.1 ST segment depression	4	11	15
Female	≥0.1 ST segment ...