Epi Info- An Statistical Software

In this ppt the viewer will able to know about Epi Info- An Statistical Software. Epi Info is statistical software for epidemiology developed by Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia (US). Epi Info has been in existence for over 20 years and is currently available for Microsoft Windows, Android and iOS, along with a web and cloud version. The program allows for electronic survey creation, data entry, and analysis. Within the analysis module, analytic routines include t-tests, ANOVA, nonparametric statistics, cross tabulations and stratification with estimates of odds ratios, risk ratios, and risk differences, logistic regression (conditional and unconditional), survival analysis (Kaplan Meier and Cox proportional hazard), and analysis of complex survey data.


Portion explained:
1. Epi Info Software
2. History of Epi Info Software
3. Features of Epi Info Software
4. Release history of Epi Info Software

1. Epi Info Software BY Dr. Jitendra Patel Associate Professor AIPS, Hyderabad, India.

2. Introduction Epi Info  is statistical software for epidemiology developed by  Centers for Disease Control and Prevention (CDC) in Atlanta, Georgia (US). Epi Info has been in existence for over 20 years and is currently available for Microsoft Windows, Android and  iOS , along with a web and cloud version. The program allows for electronic survey creation, data entry, and analysis. Within the analysis module, analytic routines include t-tests, ANOVA, nonparametric statistics, cross tabulations and stratification with estimates of odds ratios, risk ratios, and risk differences, logistic regression (conditional and unconditional), survival analysis (Kaplan Meier and Cox proportional hazard), and analysis of complex survey data. The software is an open-source project with limited support.

3. History Epi Info has been in development for over 20 years. The first version, Epi Info 1, was originally implemented by Jeff Dean as an unpaid intern in high schoo . It was an MS-DOS batch file on 5.25" floppy disks and released in 1985. MS-DOS continued to be the only supported operating system until the release of Epi Info 2000, which was written in Microsoft's Visual Basic and became the first Windows-compatible version. The last MS-DOS version was Epi Info 6.04d released in January 2001. Epi Info 2000 changed the way data was stored by adopting the Microsoft Access database format, rather than continuing to use the plain-text file format from the MS-DOS versions. Following the release of Epi Info 2000 was Epi Info 2002, then Epi Info version 3.0, and finally the open-source Epi Info 7. Epi Info 7 was made open source on November 13, 2008 when its source code was uploaded to Codeplex for the first time. The 7 series is the presently maintained Epi Info product line. Note that Epi Info 3 for Windows is different from Epi Info 3 for MS-DOS even though they share the same version number. After Microsoft shut down Codeplex in December 2017, the repository of Epi Info migrated to GitHub.

4. Features The most important functions of Epi Info are the ability to rapidly develop a questionnaire, customize the data entry process, quickly enter data into that questionnaire, and then analyze the data. For epidemiological uses, such as outbreak investigations, being able to rapidly create an electronic data entry screen and then do immediate analysis on the collected data can save considerable amounts of time versus using paper surveys. Epi Info uses three distinct modules to accomplish these tasks: Form Designer, Enter, and Analysis. Electronic questionnaires are created in the Form Designer module. Individual questions can be placed anywhere on a page and each form may contain multiple pages. The user defines both the question's prompt and the format of the data that is to be collected. Data types include numbers, text strings, dates, times, and Boolean. Users can also create drop-down lists, code tables, and comment legal fields . One of the more powerful features of Form Designer is the ability to program intelligence into a form through a feature called "check code". Check code allows for certain events to occur depending on what action a data entry person has taken. For example, if the data entry person types "Male" into a question on gender, any questions relating to pregnancy might then be hidden or disabled. Skip patterns, message boxes, and math operations are also available. Relational database modeling is supported, as users may link their form to any number of other forms in their database.

5. The "Classic Analysis" module is where users analyze their data. Import and export functions exist that allow for data to be converted between plain-text, CSV, Microsoft Excel, Microsoft Access, MySQL , Microsoft SQL Server, and other formats. Many advanced statistical routines are provided, such as t-tests, ANOVA, nonparametric statistics, cross tabulations and stratification with estimates of odds ratios, risk ratios, and risk differences, logistic regression (conditional and unconditional), survival analysis (Kaplan Meier and Cox proportional hazard), and analysis of complex survey data.

6. Older versions of Epi Info contained a Report module and a Menu module. The Report module allowed the user to edit and format the raw output from other Epi Info modules into presentable documents. The menu module allowed for the editing and re-arranging of the basic Epi Info menu structure. This module was powerful enough that several applications have been built off of it (in versions of Epi Info prior to version 7), including the National Electronic Telecommunications System for Surveillance (NETSS) for Epi Info 6. Unlike the other modules, the menu module does not have a design-mode user interface, but instead resides in a . mnu file whose scripts must be edited manually. In Epi Info 7, the Visual Dashboard assumes some of the basic functions of the report module. Epi Info 7 includes a number of nutritional anthropometric functions that can assist in recording and evaluating measurements of length, stature, weight, head circumference, and arm circumference for children and adolescents . They can be used to calculate percentiles and number of standard deviations from the mean (Z-scores) using the CDC/WHO 1978 growth reference, CDC 2000 growth reference, the WHO Child Growth Reference, or the WHO Reference 2007 . It replaces the NutStat and EpiNut modules found in prior versions of Epi Info.

7. Release history Series Version Operating System Support Release date Significant changes Epi Info for DOS 1 MS-DOS 1 Sep 1985 Epi Info for DOS 2 MS-DOS 20 Aug 1986 Epi Info 2000 2000 1.1.2 Windows 9x, NT 4.0, 2000 2 Nov 2001 First Windows-compatible version of Epi Info. Epi Info 3 3.01 Windows 9x, NT 4.0, 2000, XP 3 Nov 2003 3.3 Windows 98, NT 4.0, 2000, XP 5 Oct 2004 Windows 95 no longer supported, case-based mapping functionality added to the Analysis MAP command Epi Info 7 7.0.5 (Alpha) Windows XP, Vista, 7, Ubuntu 5 Jan 2009 Programming language changed to Visual C# .NET; MySQL and SQL Server database

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