Categorical Data Analysis Using SAS, Third Edition, 3rd Edition

Chapter 2

The 2 × 2 Table

Contents

2.1   Introduction

2.2   Chi-Square Statistics

2.3   Exact Tests

2.3.1   Exact p-values for Chi-Square Statistics

2.4   Difference in Proportions

2.5   Odds Ratio and Relative Risk

2.5.1   Exact Confidence Limits for the Odds Ratio

2.6   Sensitivity and Specificity

2.7   McNemar's Test

2.8   Incidence Densities

2.9   Sample Size and Power Computations

2.1 Introduction

The 2 × 2 contingency table is one of the most common ways to summarize categorical data. Categorizing patients by their favorable or unfavorable response to two different drugs, asking health survey participants whether they have regular physicians and regular dentists, and asking residents of two cities whether they desire more environmental ...