Cutting edge software. Empowering research since 1971.

SSI Live™ Subscription

Meet our new product delivery and support 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.

Announcing the release of LISREL 11

SSI is pleased to announce the immediate availability of LISREL11....

Announcing the Release of HLM 8.1

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

BILOG-MG, HLM, and LISREL Updates

Updated installers are now available for BILOG-MG 4, HLM 8.0...