Cutting edge software. Empowering research since 1971.
Meet SSI Live™, our new software delivery system. Compare with old licensing model.
For more than 3 decades, HLM has defined the practice in modeling hierarchical data.
LISREL is the progenitor of structural equation modeling, since 1976.
BILOG-MG and PARSCALE have enabled IRT applications in educational measurement.
SuperMix offers advanced linear and nonlinear mixed effects modeling for biostatistics.
Fast, comprehensive analysis of longitudinal human growth data with Auxal.