About SSI

Since 1971, Scientific Software International Inc. has been the market leader in specialized and advanced statistical and psychometric software program in many scientific disciplines. This includes prominent products such as LISREL, HLM, SuperMix, BILOG-MG, and PARSCALE that have defined the state-of-the-art in statistical and psychometric practice in the social and behavioral sciences, health sciences, educational measurement and evaluation, business research, and environmental sciences.