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


SSI, Inc. offers a technical support service via e-mail. 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 consult the online help files available with most of our software products, consult the accompanying manual(s) and other online documentation, and read the FAQ and Troubleshooting pages on this site.If, after following these steps, you have unanswered questions or comments, contact the SSI Technical Support Service via email as follows.

  • For ALL installation and activation problems, please send the email message to mels@ssicentral.com.
  • For LISREL questions, please send the email message to lisrel@ssicentral.com.
  • For HLM questions, please send the email message to hlm@ssicentral.com.
  • For IRT questions, please send the email message to irt@ssicentral.com.
  • For SuperMix questions, please send the email message to smix@ssicentral.com.
  • To improve the efficiency of the service, please attach the command file(s) and data file(s) to the email message. If you attach large files (exceeding 1 megabyte in size), please compress your files in an archive (using, for example, WinZip) and attach that archive instead.

In all cases, please provide the product version number and your software serial number (CD key) or activation code, as this service is only available to registered end users of the SSI software products.

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