Teacher’s Corner: Origin of the Scaling Constant d = 1.7 in Item Response Theory

Gregory Camilli

Journal of Educational and Behavioral Statistics, 1994, vol. 19, issue 3, 293-295

Abstract: The scaling constant d = 1.702 used in item response theory minimizes the maximum difference between the normal and logistic distribution functions. The theoretical and numerical derivation of d given by Haley (1952) is briefly recapitulated to provide access to curious researchers, instructors, and students.

Keywords: item response theory; normal ogive; logistic ogive (search for similar items in EconPapers)
Date: 1994
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Persistent link: https://EconPapers.repec.org/RePEc:sae:jedbes:v:19:y:1994:i:3:p:293-295

DOI: 10.3102/10769986019003293

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