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The PASS 14 free trial gives you an opportunity to evaluate the software before you purchase it.

When you click the download button with a valid email address, you can begin downloading the PASS 14 sample size software setup file.

You will receive an email with your trial license key that allows you to use the software for 7 days. If you choose to purchase the software, you can use the license key you receive to convert the trial version into the fully functional version. You will not need to reinstall PASS 14 sample size software after you purchase a license.

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"Two reasons for choosing your product [PASS]: all-around methods and options + very good documentation."

Mika Kurkilahti, PhD

Your support is always amazing. I also run [another statistical software package] and on a support / admin basis you guys are way ahead.

Neale Penman, Researcher