Advanced Search

Journal Navigation

Journal Home

Subscriptions

Archive

Contact Us

Table of Contents

Click here for more information on Research and Evaluation in Education and Psychology, 3e

Sign In to gain access to subscriptions and/or personal tools.
Educational and Psychological Measurement
This Article
Right arrow Full Text (PDF)
Right arrow References
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Alert me to new issues of the journal
Right arrow Add to Saved Citations
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Right arrow Add to My Marked Citations
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (1)
Right arrow Citing Articles via Google Scholar
Right arrow Citing Articles via Scopus
Google Scholar
Right arrow Articles by Raju, N. S.
Right arrow Articles by Oshima, T. C.
Right arrow Search for Related Content
Social Bookmarking
Add to CiteULike   Add to Complore   Add to Connotea   Add to Del.icio.us   Add to Digg   Add to Reddit   Add to Technorati   Add to Twitter  
What's this?

Two Prophecy Formulas for Assessing the Reliability of Item Response Theory-Based Ability Estimates

Nambury S. Raju

Illinois Institute of Technology, raju{at}iit.edu

T. C. Oshima

Georgia State University

Two new prophecy formulas for estimating item response theory (IRT)-based reliability of a shortened or lengthened test are proposed. Some of the relationships between the two formulas, one of which is identical to the well-known Spearman-Brown prophecy formula, are examined and illustrated. The major assumptions underlying these formulas are outlined and discussed. Both prophecy formulas appear to provide comparable estimates of reliability in the IRT context as well as in the classical test theory context.

Key Words: reliability • Spearman-Brown prophecy formula • item response theory • classical test theory

Educational and Psychological Measurement, Vol. 65, No. 3, 361-375 (2005)
DOI: 10.1177/0013164404267289
Add to CiteULike CiteULike   Add to Complore Complore   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati   Add to Twitter Twitter    What's this?


This article has been cited by other articles:


Home page
 Applied Psychological MeasurementHome page
W.-C. Wang
A Critique of Raju and Oshima's Prophecy Formulas for Assessing the Reliability of Item Response Theory-Based Ability Estimates
Applied Psychological Measurement, May 1, 2008; 32(3): 261 - 266.
[Abstract] [PDF]