Precision and sample size

Before you conduct your experiment, determine the sample size needed to achieve the desired precision of a confidence interval. Do you plan to use CIs for means or variances, one sample or two samples, independent data or paired data? Do you want to use your own CI method? Use Stata's ciwidth commands or interactive Control Panel to compute CI precision and sample size, create customized tables, and automatically graph the relationships between sample size, CI width, and probability of CI width for your planned study. And much more.

We use cookies

We use cookies to ensure that we give you the best experience on our website—to enhance site navigation, to analyze usage, and to assist in our marketing efforts. By continuing to use our site, you consent to the storing of cookies on your device and agree to delivery of content, including web fonts and JavaScript, from third party web services.

Cookie Settings

Privacy policy

Last updated: 16 November 2022

StataCorp LLC (StataCorp) strives to provide our users with exceptional products and services. To do so, we must collect personal information from you. This information is necessary to conduct business with our existing and potential customers. We collect and use this information only where we may legally do so. This policy explains what personal information we collect, how we use it, and what rights you have to that information.

Required cookies

Advertising cookies

Required cookies

These cookies are essential for our website to function and do not store any personally identifiable information. These cookies cannot be disabled.
Advertising and performance cookies

This website uses cookies to provide you with a better user experience. A cookie is a small piece of data our website stores on a site visitor's hard drive and accesses each time you visit so we can improve your access to our site, better understand how you use our site, and serve you content that may be of interest to you. For instance, we store a cookie when you log in to our shopping cart so that we can maintain your shopping cart should you not complete checkout. These cookies do not directly store your personal information, but they do support the ability to uniquely identify your internet browser and device.

Please note: Clearing your browser cookies at any time will undo preferences saved here. The option selected here will apply only to the device you are currently using.

Accept Cookies

Stata/MP4 Annual License (download)