Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)

T  Technical support


Scientific Software International offers technical support in the form of e-mail, fax, and telephone assistance. This service applies to problems in using the software and does not include statistical consultation. If you need help with modeling concepts and interpretation, please consult our short list of relevant text books or post a question to one of the following discussion lists:

SEMNET (Structural Equation Modeling)
Multilevel list server (Multilevel Modeling)

Should you encounter any problems in using any of our products, it is suggested that you use the online help instructions available with most of our software consult the accompanying manuals and other documentation and read the FAQ and Troubleshooting pages on this site.If, after following these steps, you have unanswered questions or comments, contact SSI's Technical Support Services by e-mailing us.

  • For LISREL questions, please send email to lisrel@ssicentral.com.
  • For HLM questions, please send email to hlm@ssicentral.com.
  • For IRT questions, please send email to irt@ssicentral.com.
  • For SuperMix questions, please send email to smix@ssicentral.com.
  • If you attach files and the size is considerable (anything over two to three hundred Kbytes), please compress your files in an archive (using, for example, WinZip) and attach that archive instead.

If you do not have access to e-mail, you can fax your question to: +1.847.6752140.
If you do not have e-mail or fax facilities, you can phone us at +1.847.6750720.

In all cases, please provide the product version number and your software serial number/CD key, as this service is only available to registered users of software published by SSI.

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