Biostatistics by Example Using SAS Studio

Chapter 13: Analyzing Categorical Data

Introduction

Describing the Heart_Attack Data Set

Computing One-Way Frequencies

Creating Formats

Producing One-Way Tables with Formats

Creating Two-Way Tables

Using Formats to Reorder the Rows and Columns of a Table

Computing Chi-Square from Frequency Data

Analyzing Tables with Low Expected Values

Conclusions

Problems

Introduction

Quite a bit of data used in the health sciences deals with frequency counts and proportions. For example, you may have data from a cohort study where one group of subjects has high cholesterol and another group has low or normal levels of cholesterol. You then follow these groups and count number of heart attacks that occur in each group after a predetermined period of time. One ...