PARSCALE for Windows analyzes and scores rating-scale data.


A  Academic and non-academic licenses for IRT software products
  • SSI, Inc. offers academic and non-academic (production and commercial) licenses for its IRT software products.
  • Academic licenses for BILOG-MG 3, IRTPRO 2.1, and PARSCALE 4 for Windows are available separately.
  • Academic licenses apply to end users that intend to use the software exclusively for academic research and instruction.
  • Academic licenses can be ordered using the online PDF order forms providing an academic email address.
  • Non-academic licenses apply to end users that intend to use the software for assessment.
  • Non-academic license agreements are prepared on a case to case (individual) basis. For details, see:


P  PARSCALE 4 by Eiji Muraki & Darrell Bock
  •  The flexibility and the wealth of information provided by this program have kept it in regular use by researchers around the world
  •  One, two, and three-parameter logistic models
  •  Samejima's model for graded responses
  •  Master's partial credit model
  •  Generalized partial credit model
  •  Analysis of rating scale items such as open-ended essay questions
  •  Analysis of multiple-choice items
  •  Differential item functioning (DIF)
  •  Analysis of mixtures of item types
  •  Rater's-effect analysis
  •  Multiple-group polytomous item response models
  •  Presentation quality IRT graphics, can be imported in Word, Access, etc.
  •  Detailed online HELP documentation includes syntax and examples.



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