Free Download NCSS PASS 2026 v26.0.1 | 359 MbPASS software provides sample size tools for over 1200 statistical test and confidence interval scenarios - more than double the capability of any other sample size software. Each tool has been carefully validated with published articles and/or texts.
PASS has been fine-tuned for over 25 years, and is now the leading sample size software choice for clinical trial, pharmaceutical, and other medical research. It has also become a mainstay in all other fields where sample size calculation or evaluation is needed.
Obtaining A Sample Size In PASS
In PASS, you can estimate the sample size for a statistical test or confidence interval in a few short steps. If you need guidance during any of the steps, PASS has excellent documentation, there are free training videos, and you can contact our team of PhD statisticians.
Choosing A Procedure
Finding the sample size procedure is easy using the drop-down menu, the procedure search, or the category tree.
Enter The Values
The sample size procedure tools are easy to use and have built-in help messages for every option.
Enlarge the infographic to see the descriptions of the ways that PASS helps you to enter the proper values in a sample size procedure tool.
Ready to Use Output
When a PASS procedure is run, the sample size results and corresponding Descriptions are displayed in the output window. The sample size or power curves can be clicked to be shown in a separate window for viewing or saving.
Navigation of the output is easy with the output navigation tree. The format of the output makes it easy to be viewed, copied and pasted, or saved. Multiple output runs can be sent to the output gallery for saving or for comparing sample size analyses.
Minimum System Requirements for PASS 2025
Processor: 450 MHz or faster processor, 32-bit (x86) or 64-bit (x64) processor
RAM: 256 MB (512 MB recommended)
Operating Systems:
Windows 11 or later
Windows 10
Windows 8.1
Windows 8
Windows 7
Windows Server 2022 or later
Windows Server 2019
Windows Server 2016
Windows Server 2012 R2
Windows Server 2012
Windows Server 2008 R2 SP1
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