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

5

Reading Data and Writing Data

5

List Data

6

Display Variables

7

III. Simple Analytic Commands and Graphics

9

Frequencies

9

Means

10

Tables

12

Match

15

Summarize

18

Graph

20

Exercise 1

22

IV. Navigating and Managing the Output and the Program Editor windows

25

V. Data manipulation commands

29

Sort/Cancel Sort.

29

Select/Cancel Select

30

Define/Undefine

31

Assign

32

Recode

33

If

34

Exercise 2

38

VI. Setting System Defaults

39

VII. Advanced Statistics

41

Linear Regression

41

Simple linear regression

42

Multiple linear regression

44

Logistic Regression

45

Unconditional logistic regression

46

Conditional logistic regression

49

Survival Analysis

49

Kaplan-Meier

49

Cox Proportional Hazards

51

Complex sample commands

55

Complex Sample Frequencies

55

Complex Sample Tables

58

Complex Sample Means

59

Exercise 3

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VIII. Statistics Command Options

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Stratify by

63

Weight

70

IX. Advanced Data Management Topics

75

Write (Export)

75

Delete file/table

76

Delete/undelete records

77

Relate

78

Merge

80

Acknowledgments

83

References

83

APPENDICES

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Appendix 1. Data Dictionaries

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Appendix 2. Operators/ Functions

102

Appendix 3. Answers to Exercises

105

Appendix 4. Analysis Commands By Type of Variables

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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 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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