VPG is pleased to announce the availability of flexMIRT™ Version 3.72 Release Candidate, which can be obtained through our webstore. flexMIRT™ Version 3.72 offers bug fixes and substantially faster mode for calibrating large item pools with thousands of items on millions of individuals typical of operational testing situations.
All posts by Janel Kinlaw
HLMix™ Public Beta Available
Vector Psychometric Group, LLC is pleased to announce the immediate availability of a public beta version of the brand new, entirely cloud-based software HLMix™ on SSI Live™. HLMix™ is a cloud-based program for analyzing 2- or 3-level hierarchically structured data with a wide range of outcome variable distributions and link functions. The program features a point-and-click interface compatible with any common web browser. Output is provided in both HTML and text format. In addition to standard output expected from multilevel … Read More
Educational Videos Available on YouTube
Vector Psychometric Group and Scientific Software International have created a YouTube Channel that includes educational videos on Item Response Theory Modeling, Introductory Multilevel Modeling and Advanced Multilevel Modeling.
Announcing LISREL 12
Vector Psychometric Group and Scientific Software International are pleased to announce the immediate availability of LISREL12. Read more about the latest features and models available here or watch this video.
Announcing the Release of IRTPRO™ 6.0
VPG is pleased to announce the immediate availability of IRTPRO™ Version 6.0 which includes improved scaling functionality to support UHD display resolution, tabbed child windows and an output panel to display additional information and for Academic license holders the ability to open a .flexMIRT syntax file directly within IRTPRO™. You can learn more about the new features of IRTPRO™ 6.0 in this video and on this support page. Users holding active IRTPRO™ subscription licenses are encouraged to upgrade, by logging … Read More
VPG releases flexMIRT® Version 3.6.5
VPG is pleased to announce the immediate availability of flexMIRT® Version 3.6.5. Version 3.6.5 fixes multiple bugs and has improved output and syntax parse error reporting.
Announcing the Release of IRTPRO™ 5.2
VPG is pleased to announce the immediate availability of IRTPRO™ Version 5.2 which includes an option to import current Excel spreadsheets (*.xlsx) in addition to older Excel spreadsheets (*.xls extension). Users holding active IRTPRO™ subscription licenses are encouraged to upgrade, by logging into their account on the VPG Store and navigating to the License Detail record under My Account – Licenses – Manage.
VPG releases flexMIRT® Version 3.6.4
VPG is pleased to announce the immediately availability of flexMIRT® Version 3.6.4. Version 3.6.4 fixes multiple bugs. Users holding active flexMIRT® subscription licenses are encouraged to upgrade.
Celebrating 50 Years of Structural Equation Modeling with LISREL
Scientific Software Inc., a wholly-owned subsidiary of Vector Psychometric Group, LLC, has released LISREL 11 on 06/24/2021. The substantially upgraded new version marks the golden jubilee of a seminal development in the history of Structure Equation Modeling (SEM). A little over a half century ago Professor Karl Jöreskog published a monograph in the Educational Testing Service (ETS) Research Bulletin series, entitled A General Method for Estimating a Linear Structural Equation System. The technical development was supported by the availability of … Read More
VPG releases flexMIRT® Version 3.62
VPG is pleased to announce the immediately availability of flexMIRT® Version 3.62. Version 3.62 fixes a bug with multiple-group IRT modeling, and a labeling issue in output delivery. Importantly, Version 3.62 uses a completely new pseudo random number generator (PRNG), replacing the one that has been in use since flexMIRT 2.0. The new proprietary PRNG is based on the popular Mersenne Twister 19937 generator that substantially outperforms the PRNG used by flexMIRT previously. They will lead to slightly different results … Read More