Welcome to SSI

We provide software tools for statistical data analysis, useful for work in a variety of fields such as:

• Statistics (including survey research and informatics)
• Behavioral and social sciences (such as psychology, sociology, psychiatry, criminal science, family studies, political science, developmental research, anthropology, or social work)
• Medical research (including nursing, pharmacy, epidemiology, gerontology, kinesiology, sport science, and other fields)
• Education (in administration, policy studies, test analysis, counseling, and more)
• Business research (marketing, management, economics, organization)
• Environmental science (including resource administration and longitudinal research)
• Other diverse research areas, such as language studies, engineering, law, chemistry, or urban planning

Our best-known products include:

• LISREL 8.8 New!The pioneering software for structural equation modeling now includes statistical methods for complex survey data. Create path diagrams in an easy to use interface and generate syntax directly from the diagram. The latest LISREL for Windows includes the following statistical applications.
  • LISREL for structural equation modeling.
  • PRELIS for data manipulations and basic statistical analyses.
  • MULTILEV for hierarchical linear and non-linear modeling.
  • SURVEYGLIM for generalized linear modeling.
  • CATFIRM for formative inference-based recursive modeling for categorical response variables.
  • CONFIRM for formative inference-based recursive modeling for continuous response variables.
• HLM 6 Hierarchical data modeling with power. The latest version includes an improved interface, new ways to display data, and new statistical features such as cross-classified random effects for linear models and multinomial models for three-level data.
• Item Response Theory Our group of item analysis programs (BILOG-MG, MULTILOG, PARSCALE, and TESTFACT) now feature friendly, new Windows interfaces. They are all the tools you will need to perform a wide variety of analyses on many different types of tests and items.
  

News

LISREL

• Structural Equation Modeling with LISREL workshop by Karl Jöreskog and Fan Yang Wallentin: January 16-18, 2007 in Athens, Greece. New!
• LISREL 8.8 is released on July 25, 2006. New!
• SEM Summer Institutes by the RDA Unit of the Schiefelbusch Institute for Life Span Studies at the University of Kansas in June 2007.
• Introduction to Structural Equation Modeling (in French; using LISREL), 2006, Montréal.
• The following online user guides for LISREL for Windows are now available:
  • PRELIS User's Guide
  • Interactive Graphics User's Guide
  • MULTILEV User's Guide
  • SURVEYGLIM User's Guide
• Workshop on Structural Equation Modeling by David A. Kenny and Stephanie Milan at University of Connecticut.
• A new book featuring LISREL: Structural equation modeling: a second course.

HLM

• Free upgrade to HLM 6.03 for Windows (October 2006) is available for HLM 6.0 users. New!
• Multilevel Statistical Models workshop by Professor John B. Nezlek at the University of Crete in Rethymnon, Greece.
• Two HLM workshops by Professors O'Connell and McCoach at the University of Connecticut.

IRT

• No IRT workshop is scheduled for 2006.