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

BILOG-MG and PARSCALE have enabled IRT applications in educational measurement.

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.

New features available in LISREL12

SSI is pleased to announce additional features now available in...

Educational Videos on YouTube

Vector Psychometric Group and Scientific Software International have created a...

ANNOUNCING LISREL 12

SSI is pleased to announce the immediate availability of LISREL12....