Differential Item Functioning Analysis System (DIFAS)

General Information

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.

Website:	Go to site
Description:	Differential Item Functioning Analysis System (DIFAS) computes odds ratio estimates of differential item functioning, differential test functioning, and differential step functioning effects, along with associated tests of significance. This includes the Mantel-Haenszel common log-odds ratio, the Breslow-Day test of trend in odds ratio heterogenity, and Liu-Agresti cumulative common log-odds ratio, and the relevant generalizations to step-level analyses for polytomous items.
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 not been assessed by the Section 508 Office. 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 Section508@va.gov.
Decision:	View Decisions

Decision Source:	TRM Mgmt Group
Decision Process:	One-VA TRM v24.2
Decision Date:	02/23/2024 at 14:30:51 UTC
Introduced By:	TRM Request
Vendor Name:	Randall Penfield

Vendor Release Information

The Vendor Release table provides the known releases for the TRM Technology, obtained from the vendor (or from the release source).

Version	Release Date	Vendor End of Life Date	Vendor Desupport Date
5.x	03/01/2005

Current Decision Matrix (02/21/2024)

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.

The VA Decision Matrix displays the current and future VA IT position regarding different releases of a TRM entry. These decisions are based upon the best information available as of the most current date. The consumer of this information has the responsibility to consult the organizations responsible for the desktop, testing, and/or production environments to ensure that the target version of the technology will be supported. Any major.minor version that is not listed in the VA Decision Matrix is considered unapproved for use.

Legend:

White	Approved: The technology/standard has been approved for use.
Yellow	Approved w/Constraints: The technology/standard can be used within the specified constraints located below the decision matrix in the footnote[1] and on the General tab.
Gray	Unapproved: This technology or standard can be used only if a POA&M review is conducted and signed by the Authorizing Official Designated Representative (AODR) as designated by the Authorizing Official (AO) or designee and based upon a recommendation from the POA&M Compliance Enforcement, has been granted to the project team or organization that wishes to use the technology.
Orange	Divest: VA has decided to divest itself on the use of the technology/standard. As a result, all projects currently utilizing the technology/standard must plan to eliminate their use of the technology/standard. Additional information on when the entry is projected to become unapproved may be found on the Decision tab for the specific entry.
Black	Prohibited: The technology/standard is not (currently) permitted to be used under any circumstances.
Blue	Planning/Evaluation Constraint:The period of time this technology is currently being evaluated, reviewed, and tested in controlled environments. Use of this technology is strictly controlled and not available for use within the general population. If a customer would like to use this technology, please work with your local or Regional OI&T office and contact the appropriate evaluation office displayed in the notes below the decision matrix. The Local or Regional OI&T office should submit an inquiry to the TRM if they require further assistance or if the evaluating office is not listed in the notes below.

Release/Version Information:

VA decisions for specific versions may include a ‘.x’ wildcard, which denotes a decision that pertains to a range of multiple versions.

For example, a technology approved with a decision for 7.x would cover any version of 7.(Anything) - 7.(Anything). However, a 7.4.x decision would cover any version of 7.4.(Anything), but would not cover any version of 7.5.x or 7.6.x on the TRM.

VA decisions for specific versions may include ‘+’ symbols; which denotes that the decision for the version specified also includes versions greater than what is specified but is not to exceed or affect previous decimal places.

For example, a technology approved with a decision for 12.6.4+ would cover any version that is greater than 12.6.4, but would not exceed the .6 decimal ie: 12.6.401 is ok, 12.6.5 is ok, 12.6.9 is ok, however 12.7.0 or 13.0 is not.

<Past

CY2023

CY2024

CY2025

Future>

Release

Q1

Q2

Q3

Q4

Q1

Q2

Q3

Q4

Q1

Q2

Q3

Q4

5.x

Unapproved

Decision Constraints


[1]	Users should check with their supervisor, Information Security Office (ISO) or local OIT representative for permission to download and use this software. Downloaded software must always be scanned for viruses prior to installation to prevent adware or malware. Freeware may only be downloaded directly from the primary site that the creator of the software has advertised for public download and user or development community engagement. Users should note, any attempt by the installation process to install any additional, unrelated software is not approved and the user should take the proper steps to decline those installations.

[2]	Users must ensure that Microsoft Excel and Microsoft Word are implemented with VA-approved baselines. (refer to the ‘Category’ tab under ‘Runtime Dependencies’)

[3]	Users should check with their supervisor, Information System Security Officer (ISSO) or local OIT representative for permission to download and use this software. Downloaded software must always be scanned for viruses prior to installation to prevent adware or malware. Freeware may only be downloaded directly from the primary site that the creator of the software has advertised for public download and user or development community engagement. Users should note, any attempt by the installation process to install any additional, unrelated software is not approved and the user should take the proper steps to decline those installations.

Note:

At the time of writing, version 5.0 is the latest version, released 03/01/2005.

References

The following reference(s) are associated with this entry:
Type	Name	Source	Description
There are no references identified for this entry.

Technology Components

Note: This list may not be complete. No component, listed or unlisted, may be used outside of the technology in which it is released. The usage decision for a component is found in the Decision and Decision Constraints.
Name	Description
No components have been identified for this entry.

VA Categories View the VA Categorization Framework

Domain Area	Category	Customer Guidance	Category Locked By ELT Date
Collaboration and Electronic Workplace Productivity Software	Miscellaneous Productivity Tools and Utilities

Operating Systems Supported by the Technology

Windows Client - Approved w/Constraints
Windows Server - Approved w/Constraints

Technologies/Standards Relationships

Runtime Dependencies:

Microsoft Excel - (required for some configurations)
Microsoft Word - (required for some configurations)

Comparable Technologies:

No comparable entries have been identified.

Companion Technologies/Supported Standards:

No companion technologies/standards have been identified.

General Analysis

Adoption Benefits

This technology may improve productivity for specific staff whose responsibilities include improvements to specialized tasks related to calculating differential item functioning.
At the time of writing, this technology provides functionality not available through other approved TRM options.
At the time of writing, no National Institute of Standards and Technology (NIST) vulnerabilities had been reported and no VA Cyber Security Operations Center (CSOC) bulletins had been issued for the latest versions of this technology.

Adoption Risks

There has been no recent development activity on this technology.
As freeware, this product will be without clearly defined support options which may result in suboptimal enterprise level support.
System scans indicate that this technology is no longer in use within the VA network.
There is limited publicly available technical documentation for this technology.
The potential exists to store Personally Identifiable Information (PII), Protected Health Information (PHI) and/or VA Sensitive data and proper security standards must be followed in these cases.
There is no indication based on either the vendor documentation or the Cryptographic Module Validation Program (CMVP) that this technology is Federal Information Processing Standard (FIPS) 140-2 compliant.

Architectural Risks

This technology is not portable as it runs only on Windows platforms.

Inside VA

Budget and Performance

Inside the Media Room

National Observances

Special Events

VA Technical Reference Model v 24.3

General Information

Vendor Release Information

Current Decision Matrix (02/21/2024)

Decision Constraints

References

Technology Components

VA Categories View the VA Categorization Framework

Operating Systems Supported by the Technology

Technologies/Standards Relationships

Runtime Dependencies:

Comparable Technologies:

Companion Technologies/Supported Standards:

General Analysis

Adoption Benefits

Adoption Risks

Architectural Risks

CONNECT

VA HOME

QUICK LIST

RESOURCES

ADMINISTRATION

VA Technical Reference Model v 24.3

General Information

Vendor Release Information

Current Decision Matrix (02/21/2024)

Decision Constraints

References

Technology Components

VA Categories View the VA Categorization Framework

Operating Systems Supported by the Technology

Technologies/Standards Relationships

Runtime Dependencies:

Comparable Technologies:

Companion Technologies/Supported Standards:

General Analysis

Adoption Benefits

Adoption Risks

Architectural Risks

EMAIL UPDATES