Introduction to Epi Info Version 3.4.1) Analyze Data …

Introduction to Epi Info (Version 3.4.1) Analyze Data

Module

By

Kevin M. Sullivan, PhD, MPH, MHA and Minn Minn Soe, MD, MCTM, MPH

Department of Epidemiology

Rollins School of Public Health of Emory University

Figure 1. Epi Info Introductory Screen.

Intro to Epi Info 3.4.1 Analysis.doc October 2007

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TABLE OF CONTENTS

I.

Introduction

1

II.

Basic Commands

Reading Data and Writing Data

List Data

Display Variables

5

5

6

7

III.

Simple Analytic Commands and Graphics

Frequencies

Means

Tables

Match

Summarize

Graph

9

9

10

12

15

18

20

Exercise 1

22

IV.

Navigating and Managing the Output and the Program Editor windows

25

V.

Data manipulation commands

Sort/Cancel Sort.

Select/Cancel Select

Define/Undefine

Assign

Recode

If

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29

30

31

32

33

34

Exercise 2

38

VI.

Setting System Defaults

39

VII.

Advanced Statistics

Linear Regression

Simple linear regression

Multiple linear regression

Logistic Regression

Unconditional logistic regression

Conditional logistic regression

Survival Analysis

Kaplan-Meier

Cox Proportional Hazards

Complex sample commands

Complex Sample Frequencies

Complex Sample Tables

Complex Sample Means

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41

42

44

45

46

49

49

49

51

55

55

58

59

Exercise 3

62

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VIII. Statistics Command Options

Stratify by

Weight

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70

IX.

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75

76

77

78

80

Advanced Data Management Topics

Write (Export)

Delete file/table

Delete/undelete records

Relate

Merge

Acknowledgments

83

References

83

APPENDICES

Appendix 1.

Appendix 2.

Appendix 3.

Appendix 4.

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Data Dictionaries

Operators/ Functions

Answers to Exercises

Analysis Commands By Type of Variables

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85

102

105

113

I.

INTRODUCTION

Epi Info is a program developed by the Centers for Disease Control and Prevention (CDC) that runs under the

Microsoft Windows? operating system and provides programs for data entry and analysis. The Epi Info

program and help information can be found at epiinfo. The purpose of this document is to

introduce the Analyze Data module, discussing commands in a sequence appropriate for learning the program.

More detailed information on some topics is provided in the later chapters and details of the commands can be

found in Epi Info¡¯s on-line help. Also presented is the program OpenEpi () and how it can

be used to supplement Epi Info.

Figure 1 on the front of this document presents the Epi Info (3.4.1) introductory screen (release date: July 3,

2007). To start the Analyze Data module, click on the Analyze Data button in the lower left of the screen

or from the pull-down menu by Programs ¡ú Analyze Data (see Figure 1).

The main Analyze Data screen is shown in Figure 2. The screen is composed of three windows. There is a

narrow window of the left side of the screen labeled Analysis that presents the commands, i.e., the ¡°command

tree¡±; the largest window labeled Analysis Output comprises the upper right portion of the screen and is

where the output is presented; and a smaller window in the bottom right of the screen labeled Program Editor

where text commands appear.

Figure 2. Analyze Data main screen, Epi Info.

Before discussing the Analysis commands, let¡¯s review some basics. To exit the Analyze Data module, you

can click on the Exit button at the top of the left window; to minimize the module, click on the ¡°_¡± button in the

upper right-hand corner of the left window. The Help button at the bottom of the left window takes you to the

Epi Info Help system. You can resize any of the three windows by placing the cursor where two windows

meet, hold the left mouse button, and drag the border.

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