Epi info is a free set of software tools for public health practitioners and researchers across the globe. Open source epidemiologic statistics for public health web. Epi info is an epidemiological and statistical software system designed by the u. Epi info prints this information in the area labeled summary odds ratio. A blank table opens in the statcalc application window. Enter the data from the nonsmokers sample table in the strata 1 tab.
Dos version of epi info modules statcalc and epi table, to improve on the types of analyses provided by these modules, and to provide a number of tools and calculations not currently available in epi info. R, like stata and sudaan, has a wide range of analytic capabilities. Advanced management and analysis of data using epi info for windows. Does not calculate finite population corrections, so either sampling fraction must be small or sampling must be with replacement. Epi info also provides data analyses and a customized data entry experience for the professional in the global community of health.
It computes the stratified test statistic by combining the stratumlevel linear rank statistics for the score type that you specify. May 17, 2015 stratified analysis is a powerful statistical approach that allows you to test for confounding and interaction, but unlike logistic regression, it is quite simple and doesnt distance you from. To do a stratified analysis, epi info must first know your main variable i. Note that epi info 3 for windows is different from epi info 3 for msdos even though they share the same version number. Finally, with count data, openepi also performs a test for trend, for both crude and stratified data. Epi info is a public domain suite of interoperable software tools for. The risk ratios for the age stratified analysis are similar rr 1. The 7 series is the presently maintained epi info product line. Does not calculate finite population corrections, so either. Epi 510 epidemiologic data analysis department of epidemiology. R, like sas, stata, spss, and epi info, is a generalpurpose statistical package.
Epi info is a public domain suite of interoperable software tools for microsoft windows, designed for the global community of public health practitioners and researchers. From the epi info 7 main menu, click he statcalc button. This indicates that there was confounding by age in the overall sample. Similar to epi info, in a stratified analysis, both crude and adjusted estimates are. Openepi is free and open source software for epidemiologic statistics. Finally, with count data, openepi also performs a test for trend, for both crude data and. Relating influenza epidemics to childhood leukemia in. Epidemiology analysis techniques for largescale populationbased study with complex survey designs, outcomes research, and introduction to epi info software. However, anyone who has tried doing stratified analysis by keyboard entry in stata version 7 will know that it is anything but easy. Risk factors for sexually transmitted infections in kuwadzana, zimbabwe. Creating data entry forms questionnaires in epi info 7 youtube. Epi info tm software is in the public domain and freely available for use. But im not sure whether that means actual sas program files and datasets.
Its been a long time between updates, but a lot has been accomplished. Dec 26, 20 brief guide to creating data entry forms questionnaires in epi info 7. Hopefully in some small way, the release of free software for international public health is appropriate for september 11. Introduces concepts and programming skills necessary to analyze data sets for casecontrol and cohort studies. In this instance df 2 1 not shown by epi info and c. Another feature of epi info is a set of three programs for the analysis of cluster. Software epidemiology, biostatistics and occupational. Epi info 7 was made open source on november, 2008 when its source code was uploaded to codeplex for the first time. In this lesson, we focus on overall assessment, which is the most conceptually and mathematically complicated of the four steps. Epi info stratified sampling, with or without clustering. Used in epi 418 rapid surveys and featured in the epi 418 software training manual. Whether you are researching infectious diseases, investigating exposure to pathogens, or studying chronic diseases, stata provides the data management and statistical tools to support your research. Both stratumspecific analyses and overall assessment require a point estimate, an interval estimate, and a test of hypothesis. Which statistical software is best to learn for the field of.
A stratified analysis one way of identifying confounding is to examine the primary association of interest at different levels of a potential confounding factor. With rate data, openepi provides adjusted rate ratios and. Here, we are going to use epi info to analyse data in the form of continuous variables, i. A webbased epidemiologic and statistical calculator for. Apr 15, 2002 sadly, epi info 2000 has done away with it. It has features for processing, managing, and analyzing epidemiological data, including complex survey data csample component. Brief guide to creating data entry forms questionnaires in epi info 7. Doepi is a series of computer exercises and a framework for making new exercises based on the epi info programs for epidemiologic computing. This supports an assumption that differences in strataspecific odds ratios may be random no statistical interaction. Advanced management and analysis of data using epi info.
This is the only software program, other than more. Nov 11, 2015 comparing sas, stata, and r, sas is widely used, in part because drug trial data has to be submitted to the fda in a sascompatible format. The side by side tables below examine the relationship between obesity and incident cvd in persons less than 50 years of age and in persons 50 years of age and older, separately. For a quick introduction to epi info, read chapter 2, install the system as described in chapter 4, and follow the tutorial instructions in bold type like this one at the beginning of each chapter. Health professionals who do not have a background in technology and wish to use epi info are also covered because epi info uses maps, epidemiologic statistics and graphs which are easy to be used. Finally, with count data, openepi also performs a test for trend, for both crude data and stratified data. We saw that obese subjects were more likely to be 50 and older, and we also saw that those over age 50 had a greater risk of cvd. It provides easy data entry form and database construction, a customized data entry experience, and data analyses with epidemiologic statistics, maps, and graphs for public health professionals who may lack an informational technology background.
Openepi is a third party provider that supplements epi info with addional computations. The system contains three outbreak investigations, a research survey, four exercises in advanced epi info programming, and four exercises in public health surveillance. Openepi provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and persontime analysis, sample size and power calculations, random numbers, sensitivity, specificity and other evaluation statistics, r x c tables, chisquare for doseresponse, and links to other useful sites. Epiinfo epi info is a freely downloadable software package developed by. This chapter considers the analysis of a binary outcome disease d and. Introduction statcalc user guide support epi info cdc.
Openepi provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and persontime. This is the only software program, other than more complex statistical packages such as stata and sudaan, for doing this form of analysis. Epi 510 epidemiologic data analysis 3 intended for students planning to take epi 514. Simple random, convenience, systematic, cluster, stratified statistics help duration. From the statcalc application main page, select tables 2 x 2, 2 x n. Stratifying a dataset separates the population into distinct categories based on levels of a parameter i. Stata v 12 stratified analysis of k 2x2 tables umass. The classical monographs of rao 1973 and searle 1971 provided an excellent discussion of the general theory of linear models. A webbased epidemiologic and statistical calculator. Stratified analysis proc npar1way provides stratified analysis of twosample data for the following score types. The method of calculating the chisquare interaction statistic in epi info is. Advanced management and analysis of data using epi info for windows risk factors for sexually transmitted infections in kuwadzana, zimbabwe u.
It is the first step toward an entirely webbased suite of epidemiologic software tools. Like epi info, it is available at no cost unlike epi info, it is also opensource. Department of health and human services centers for disease control and prevention coordinating of. Epi info can be used at several levels depending on your level of experience and needs. Openepi is free and open source software that provides statistics for counts and measurements in descriptive and. Two hotline staff members respond to 20 to 40 inquiries per day by telephone, fax, and email. Similar to epi info, in a stratified analysis, both crude and adjusted estimates are provided so that the assessment of confounding can be made. This openepi provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and persontime analysis, sample size and power calculations, random numbers, sensitivity, specificity and other evaluation statistics, r x c tables, chisquare for doseresponse, and links to other useful sites. To leave epi info, press f10 to leave analysis and return to the main epi info menu, and then press f10 or select quit to leave epi info.
Overall and by smoking note there are fancier ways of doing this, but the syntax can be complicated. Select one of the following tools from the dropdown list. Advanced management and analysis of data using epi info for. The program includes complex sample modules for the analysis of cluster surveys. Stratified tables statcalc user guide support epi info cdc. Designed for the global community of public health practitioners and researchers, it provides tools for easy form and database construction, data entry, and analysis. Openepi provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and persontime analysis, sample size and power. Epi info is a public domain software package developed by the u.
Stata version 7 has a suite of programs called epitab that are designed for epidemiology and can handle keyboard data entry. Other software and online calculators openepi is a website that provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched pair and persontime analysis, sample size and power calculations, random numbers, sensitivity, specificity and other evaluation. Linear regression models have been the focus of numerous monographs and research papers. In january 2009, cdc produced a report software for analyis. Stratified analysis for twobytwo tables, with a variety of adjusted statistics across strata 2. Conducting stratified analysis to test for confounding and. Control of confounding in the analysis stratified analysis. Provides students handson experience in using epidemiologic data sets for stratified analyses with stata and r. An important feature in epi infos acceptance is the epi info hotline. Epidemiologists have relied on stata for over 30 years because of its specialized epidemiologic commands, accuracy, and ease of use. With rate data, openepi provides adjusted rate ratios and rate differences, and tests for interaction. Openepi is free and open source software that provides statistics for counts and measurements in descriptive and analytic studies, stratified analysis with exact confidence limits, matched poor and persontime analysis sample size and power calculations, random numbers, sensitivity, specificity and other.