Vector Psychometric Group

Exclusive webinar for HLM subscription holders!!

Scientific Software International Inc. is pleased to continue our webinar series for our SSI Live™ subscription license holders. Our next event will again feature the developer of the HLM program, Professor Stephen Raudenbush. Professor Raudenbush will share his thoughts on inference for variance components in hierarchical linear models and demonstrate the new profile likelihood feature in HLM 8.2 just released.

Time: Monday, August 23 3:00 – 4:00 pm ET

To learn more about the webinar and to register: click here –

Welcome! You are invited to join a webinar: Inference for Variance Components in Hierarchical Linear Models. After registering, you will receive a confirmation email about joining the webinar. Variance components are of high interest in hierarchical linear models. We’d like to know, for example, how variable treatment effects are in a multi-site trial; how much children vary in their rates of learning; or how variable are effect sizes in a met-analysis. Moreover, inferences about other ...

FDA issued a Guidance for Conduct of Clinical Trials during COVID-19 Pandemic. Thought it may be of interest.
https://buff.ly/33ErBgR

Vector Psychometric Group has acquired Scientific Software International, Inc.

• Vector Software Acquisition, a sole subsidiary of Vector Psychometric Group, acquired Scientific Software International, Inc. expanding Vector’s statistical software offerings

• Vector Psychometric Group’s software products have traditionally focused on item response theory and adaptive testing. The acquisition of Scientific Software International, Inc. strengthens Vector’s psychometric software market share and expands their portfolio to include structural equation modeling and hierarchical linear (mixed effects) modeling software packages

• The terms of the agreement were not made public.

Vector Psychometric Group, a leading provider of psychometric and data analytic solutions for clinical outcomes and educational and psychological assessment, has acquired Scientific Software International, Inc., a market-leader in statistical software for social, behavioral, and biostatistical sciences.

Scientific Software International, Inc. (SSI) has been developing, publishing, and distributing specialized statistical software products since 1971. SSI has been a driving force behind many widely used statistical software packages, which includes HLM® and SuperMix® for multilevel modeling; BILOG-MG®, PARSCALE®, and IRTPRO® for item response theory modeling; and LISREL®, the progenitor of structural equation modeling.

Jointly VPG and SSI provide nearly 60 years of statistical software development experience. This combined experience will allow the companies to expand their current software capabilities, rejuvenate existing products, and build on their long history of advancing the psychometric and behavioral analytic sciences through software.