Scientific Software INTERNATIONAL
Rigorous, Reliable Results
Our mission is to be scientific leaders in software development for the analysis of health, behavioral, and educational outcomes.
Who we are
Innovative Statistical Software
SSI provides nearly 60 years of statistical software development and licensing experience. We offer a wide variety of PC and cloud-based statistical software packages for a wide variety of specialized statistical analyses. SSI offers multiple solutions for item response theory, factor analysis, structural equation modeling, longitudinal analysis, and hierarchical linear models (mixed effects models).
Our Products
SSI Industry Leading Software
Psychometric Software
SSI has developed some of the most capable and cutting-edge psychometric software for fitting and scoring item response theory (IRT) models that is used widely in educational testing, psychological assessment, and health outcomes measurement research and operations. Our clients span the globe and our software programs support some of the most well-known assessment programs with the highest stakes.
Statistical Software
SSI has been credited as one of the most important developer and distributor of statistical analysis software for the social, behavioral, and health sciences for over 50 years. Its catalog of statistical software includes programs for structural equation modeling, multilevel modeling, generalized and nonlinear random effects modeling, and growth modeling.
