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VA Technical Reference Model v 20.4

Differential Item Functioning Analysis System (DIFAS)
Differential Item Functioning Analysis System (DIFAS) Technology

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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: 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.

There is not a dedicated website for this technology.
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 v19.11
Decision Date: 11/27/2019
Introduced By: TRM Request
Vendor Name: Randall Penfield
- The information contained on this page is accurate as of the Decision Date (11/27/2019).