This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Camilli, G. Search for Related Content Social Bookmarking                         What's this?

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

Rutgers, The State University of New Jersey

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.

Key Words: item response theory • normal ogive • logistic ogive

Journal of Educational and Behavioral Statistics, Vol. 19, No. 3, 293-295 (1994)
DOI: 10.3102/10769986019003293


CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				J. C. Immekus and S. J. Maller Item Parameter Invariance of the Kaufman Adolescent and Adult Intelligence Test Across Male and Female Samples Educational and Psychological Measurement, December 1, 2009; 69(6): 994 - 1012. [Abstract] [PDF]