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VA Technical Reference Model v 24.4

Power Analysis & Sample Size (PASS)
Power Analysis & Sample Size (PASS) Technology

General InformationGeneral Information help

Technologies must be operated and maintained in accordance with Federal and Department security and privacy policies and guidelines. More information on the proper use of the TRM can be found on the TRM Proper Use Tab/Section.

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Description: Power Analysis & Sample Size (PASS) is research software used for calculating the number of subjects that should be used in a study. This technology performs power analysis and provides sample size utilities for over 740 statistical test and confidence interval scenarios. This technology contains functionality for sample size estimation and power analysis for the following types of tests: one or two means, multiple means, correlation, normality tests, variances, one proportion, two proportion chi-square, survival, and regression.

This technology does not utilize a database to store data. User settings, procedure templates, and calculation values are stored on the local hard drive. User settings are stored in the user`s AppData folder by default. The procedure templates contain the settings that are used to generate reports and are stored in the user`s Documents folder by default. The user has control over where these are stored and the location can be changed in System Options.
Technology/Standard Usage Requirements: Users must ensure their use of this technology/standard is consistent with VA policies and standards, including, but not limited to, VA Handbooks 6102 and 6500; VA Directives 6004, 6513, and 6517; and National Institute of Standards and Technology (NIST) standards, including Federal Information Processing Standards (FIPS). Users must ensure sensitive data is properly protected in compliance with all VA regulations. Prior to use of this technology, users should check with their supervisor, Information Security Officer (ISO), Facility Chief Information Officer (CIO), or local Office of Information and Technology (OI&T) representative to ensure that all actions are consistent with current VA policies and procedures prior to implementation.
Section 508 Information: This technology has been assessed by the Section 508 Office and found non-conformant. The Implementer of this technology has the responsibility to ensure the version deployed is 508-compliant. Section 508 compliance may be reviewed by the Section 508 Office and appropriate remedial action required if necessary. For additional information or assistance regarding Section 508, please contact the Section 508 Office at Please see reference tab for more information concerning product versions.
Decision: View Decisions

Decision Source: TRM Mgmt Group
Decision Process: One-VA TRM v22.10
Decision Date: 10/10/2022 at 17:00:10 UTC
Aliases: PASS
Introduced By: TRM Request
Vendor Name: NCSS Statistical Software
- The information contained on this page is accurate as of the Decision Date (10/10/2022 at 17:00:10 UTC).