BILOG-MG is an extension of BILOG that is designed for the efficient analysis of binary items, including multiple-choice or short-answer items scored right, wrong, omitted, or not-presented. BILOG-MG is capable of large-scale production applications with unlimited numbers of items or respondents. It can perform item analysis and scoring of any number of subtests or subscales in a single program run. All the program output may be directed to text files for purposes of selecting items or preparing reports of test scores. 


BILOG-MG implements an extension of Item Response Theory (IRT) to multiple groups of respondents. It has many applications in test development and maintenance. Applications of multiple-group item response theory in education assessment and other large-scale testing programs include the following features.

  • Nonequivalent groups equating for maintaining the comparability of scale scores as new forms of the test are developed.
  • Vertical equating of test forms across school grades or age groups.
  • Analysis of Differential Item Functioning (DIF) associated with demographic or other group differences.
  • Detecting and correcting for item parameter trends over time (DRIFT).
  • Calibrating and scoring tests in two-stage testing procedures designed to reduce total testing time.
  • Estimating latent ability or proficiency distributions of students in schools, communities, or other aggregations.

In addition, BILOG-MG provides for variant items that are inserted in tests for purpose of estimating item statistics, but that are not included in the scores of the examinees.


Free trial edition

Please note that the only limitations of the free BILOG-MG trial edition are that it expires 15 days after installation and that technical support is not available.


  • Save BILOG-MG3TrialSetup.exe to a temporary location.
  • Use File Explorer to open the temporary location.
  • Ensure that the saved file is approximately 19,161 KB in size. If not, please save it again.
  • Click on the Run as Administrator option on the right-click menu for BILOG-MG3TrialSetup.exe.
  • Delete BILOG-MG3TrialSetup.exe from the temporary location.






BILOG-MG 3 is compatible with Windows 10. It has been tested on Windows 10 and no problems were reported.


BILOG-MG 3 is compatible with Windows 8. It has been tested on Windows 8 and no problems were reported.


BILOG-MG 3 is compatible with Windows 7. It has been tested on Windows 7 and no problems were reported.