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VA Technical Reference Model v 24.4

Proc Traj
Proc Traj 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: Proc Traj is a Statistical Analysis Systems (SAS)-based add-in macro for group-based developmental trajectory models. A trajectory describes the course of a measured variable longitudinally, over age or time. Group-based trajectory modeling assumes that the population is composed of distinct groups, each with a different underlying trajectory. The equation describing the likelihood of an individual`s observed repeated measures is composed of two elements: the probability of group membership and the probability of the observed data given group membership.

This product is a Dynamic Link Library (DLL) file that is placed in a SAS folder on the user`s local computer. This product does not use a database.
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
Decision: View Decisions

Decision Source: TRM Mgmt Group
Decision Process: One-VA TRM v23.10
Decision Date: 10/13/2023 at 18:32:48 UTC
Introduced By: TRM Request
Vendor Name: Bobby L. Jones
- The information contained on this page is accurate as of the Decision Date (10/13/2023 at 18:32:48 UTC).