RMT 16:3 Notations and Quotations

Reviewers Reviewed ....

"I would suggest rethinking your reliance on Rasch fit statistics as a criterion for item rejection .... In many cases, the best (most highly discriminating) items would be rejected if one relied on Winsteps' Infit and Outfit statistics."
NCME reviewer, as reported by Ryan Bowles

Conventional wisdom says "When items correlate highly with one another, those with the highest average correlations are the best items" (Jm Nunnally, Psychometric Theory, 1967, p. 261). But it is well-established that there can be too much of a good thing ... inter-item correlations can become too high.

"Other things being equal, interdependent items tend to decrease the reliability of a test. ... For the tendency becomes to answer [correctly] neither item or both items and thereby produces an effect equivalent to reducing the number of items in a test." (Percival M. Symonds, "Factors influencing test reliability", Journal of Educational Psychology, 1928, 19, 73-87. Italics his.)

Rasch Infit and Outfit statistics flag items to which responses are overly predictable, an indication that, in some way, they are interdependent with other items.


"The development of common constructs can also contribute to a cohesive knowledge core and further enhance theoretical understanding."
Michael J. Feuer, Lisa Towne, and Richard J. Shavelson (2002) Scientific Culture and Educational Research. Educational Researcher, 31, 8, 11


The growth of Rasch publications in medical literature according to Medline. Its logistic shape (predicted by the bibliographic analyses of Derek de Solla Price) suggests a ceiling of 500 articles per year, at which point Rasch will be regarded as routine. Courtesy of William Fisher.



RMT 16:3 Quotations and Notations. … 16:3 p.884ff.


RMT 16:3 Quotations and Notations. … Rasch Measurement Transactions, 2002, 16:3 p.884ff.



Rasch-Related Resources: Rasch Measurement YouTube Channel
Rasch Measurement Transactions & Rasch Measurement research papers - free An Introduction to the Rasch Model with Examples in R (eRm, etc.), Debelak, Strobl, Zeigenfuse Rasch Measurement Theory Analysis in R, Wind, Hua Applying the Rasch Model in Social Sciences Using R, Lamprianou El modelo métrico de Rasch: Fundamentación, implementación e interpretación de la medida en ciencias sociales (Spanish Edition), Manuel González-Montesinos M.
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Rasch Models for Measurement, David Andrich Constructing Measures, Mark Wilson Best Test Design - free, Wright & Stone
Rating Scale Analysis - free, Wright & Masters
Virtual Standard Setting: Setting Cut Scores, Charalambos Kollias Diseño de Mejores Pruebas - free, Spanish Best Test Design A Course in Rasch Measurement Theory, Andrich, Marais Rasch Models in Health, Christensen, Kreiner, Mesba Multivariate and Mixture Distribution Rasch Models, von Davier, Carstensen
Rasch Books and Publications: Winsteps and Facets
Applying the Rasch Model (Winsteps, Facets) 4th Ed., Bond, Yan, Heene Advances in Rasch Analyses in the Human Sciences (Winsteps, Facets) 1st Ed., Boone, Staver Advances in Applications of Rasch Measurement in Science Education, X. Liu & W. J. Boone Rasch Analysis in the Human Sciences (Winsteps) Boone, Staver, Yale Appliquer le modèle de Rasch: Défis et pistes de solution (Winsteps) E. Dionne, S. Béland
Introduction to Many-Facet Rasch Measurement (Facets), Thomas Eckes Rasch Models for Solving Measurement Problems (Facets), George Engelhard, Jr. & Jue Wang Statistical Analyses for Language Testers (Facets), Rita Green Invariant Measurement with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments (Facets), George Engelhard, Jr. & Stefanie Wind Aplicação do Modelo de Rasch (Português), de Bond, Trevor G., Fox, Christine M
Exploring Rating Scale Functioning for Survey Research (R, Facets), Stefanie Wind Rasch Measurement: Applications, Khine Winsteps Tutorials - free
Facets Tutorials - free
Many-Facet Rasch Measurement (Facets) - free, J.M. Linacre Fairness, Justice and Language Assessment (Winsteps, Facets), McNamara, Knoch, Fan

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