You may notice that StatCalc does not offer an exhaustive list of study design types so you may find that your specific study type may not be listed here. Each study type uses a different formula for calculating sample size so you need to think carefully about which type is yours. Choosing the Type of Study Design to Use Within the Sample Size and Power tool there are 3 choices: Population survey, Cohort or cross-sectional, and Unmatched case-control. This module will not describe the equations used to calculate sample size or the terminology since these will be covered by the professors in the Sample Size lecture. We will be only learning to use the Sample Size and Power tool in this module. No memorization of formulas or mathematical equations is necessary! StatCalc has several tools: Sample Size and Power, Chi Square for Trend, and Tables (2X2, 2XN). You input your parameters such as expected outcome value and desired precision, and then StatCalc determines the sample size. StatCalc is also one of the easiest tools to use. It is used by researchers who prefer as well as have the resources to analyze their data with software programs such as STATA or SPSS. StatCalc is one of the most useful parts of Epi-Info. Getting Started with StatCalc Other Epi-Info sessions in this course use the major modules of Epi-Info such as Form Designer and Analyze Data. If you do not have it, go to the main page on the Moodle Web site to access the CDC s download page for Epi-Info. WHAT YOU NEED Epi-Info downloaded on your machine. Input different parameters into StatCalc s calculator for viewing relationship between certain parameters and the sample size calculation. LESSON ACTIVITIES Use StatCalc to calculate sample sizes for descriptive cross-sectional, cohort, and case-control studies. You will learn how to use StatCalc to determine sample sizes for different types of studies, experiment with changes in study design parameters for understanding the relationship between these parameters and sample size, and become familiar with StatCalc s limitations as a tool. StatCalc is a tool that automatically generates a range of sample sizes for different confidence and precision levels. 1 StatCalc - Calculating a Sample Size with Epi-Info In this lesson, you will learn how to use the StatCalc feature of Epi-Info to calculate the sample size of a study you may design.
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