, Volume 42, Issue 4, pp 631–634

The rasch model, the law of comparative judgment and additive conjoint measurement

  • H. E. Brogden
Notes And Comments

DOI: 10.1007/BF02295985

Cite this article as:
Brogden, H.E. Psychometrika (1977) 42: 631. doi:10.1007/BF02295985


Relationships between the Rasch model and both the law of comparative judgment and additive conjoint measurement are discussed. The distance between the ability of Persona and the difficult of Itemi is, in the Rasch model, the baseline value corresponding to the probability thata will respond correctly toi, where this probability is interpreted as the area under a logistic curve (which is substantially equivalent to the normal curve) and is thus an application of the law of comparative judgment. Under certain assumptions, the Rasch model is also a special case of additive conjoint measurement and, properly reinterpreted, may be usefully applied in contexts other than individual differences.

Key words

measurement theory Rasch model test theory ability inverse logistic 

Copyright information

© Psychometric Society 1977

Authors and Affiliations

  • H. E. Brogden
    • 1
  1. 1.Department of Psychological SciencesPurdue UniversityWest Lafayette

Personalised recommendations