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.

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.

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

Vector Software Acquisition, a sole subsidiary of Vector Psychometric Group, acquired Scientific Software International, Inc. expanding Vector’s statistical software offerings. Vector Psychometric Group (VPG), a leading provider of psychometric and data analytic solutions for clinical outcomes, educational, and psychological assessment, has acquired Scientific Software International, Inc. (SSI), a market-leader in statistical software for social, behavioral, and biostatistical sciences. SSI has been developing, publishing, and distributing specialized statistical software products since 1971. SSI has been a driving force behind many widely … Read More