Vector Psychometric Group and Scientific Software International have created a...
Cutting edge software. Empowering research since 1971.
Purchase on SSI Live™
Meet SSI Live™, our new software delivery system. Compare with old licensing model.
Hierarchical Modeling
For more than 3 decades, HLM has defined the practice in modeling hierarchical data.
Structural Equation Modeling
LISREL is the progenitor of structural equation modeling, since 1976.
Item Response Theory
Mixed Modeling
SuperMix offers advanced linear and nonlinear mixed effects modeling for biostatistics.
Growth Modeling
Fast, comprehensive analysis of longitudinal human growth data with Auxal.
