Sample Size & Power
PASS software provides sample size tools for over 1100 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.
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. Watch a short video to learn how to select your desired procedure in PASS.
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. You can also watch this video to see an example of using a procedure window in PASS.
Minimum System Requirements for PASS 2023
In order to run PASS 2023, your computer must meet the following minimum standards:
- 450 MHz or faster processor
- 32-bit (x86) or 64-bit (x64) processor
- 256 MB (512 MB recommended)
- Windows 11 or later
- Windows 10
- Windows 8.1
- Windows 8
- Windows 7
- Windows Vista with Service Pack 2 or higher
- Windows Server 2019 or later
- Windows Server 2016
- Windows Server 2012 R2
- Windows Server 2012
- Windows Server 2008 SP2/R2
Administrative rights required during installation only
Third Party Software:
Microsoft .NET 4.6 (Comes pre-installed with Windows 10 or later and Windows Server
2016 or later. Installation required on Windows 8.1 or earlier and Windows Server
2012 R2 or earlier. For systems where .NET 4.6 installation is required, a .NET 4.6
download helper will start automatically when you run the PASS setup file.)
Microsoft Windows Installer 3.1 or higher
Adobe Reader® 7 or higher (required for the Help System only)
Hard Disk Space:
400 MB for PASS (plus space for Microsoft .NET 4.6 if not already installed)
Any Windows-compatible inkjet or laser printer
PASS 2023 on a Mac
A Windows emulator (such as Parallels) is required to run https://www.ncss.com/support/windows-on-a-mac/.