SAITEM= item numbers in SFILE= and SAFILE= (with one ISGROUPS=) = No

Rating-scale Structure-Threshold Files SFILE= and Structure-Threshold Anchor Files SAFILE= (Rating (or partial credit) scale step anchoring files) have the format:

 

For only one active grouping in ISGROUPS=, or no ISGROUPS=

scored-category number

Andrich threshold relative to item difficulty (step-calibration)

 

For multiple groupings in ISGROUPS=, or SAITEM= Yes

example-item-number in grouping

scored-category number

Andrich threshold relative to item difficulty (step-calibration)

 

Example 1: "Liking for Science" structure-threshold anchor file:

Standard format for the Rating Scale model:

ISGROUPS= ; no groupings specified

SAFILE=*

0 0 ; bottom category threshold is 0 as a place-holder

1 -1.8 ; Rasch-Andrich threshold from category 0 to category 1

2 1.8 ; Rasch-Andrich threshold from category 1 to category 2

*

 

Alternative format allowing an example item number to identify the grouping, say item 10

SAITEM=Yes

SAFILE=*

10 0  0 ; bottom category threshold is 0 as a place-holder

10 1 -1.8

10 2 1.8

*

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Rasch Books and Publications
Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, 2nd Edn, 2024 George Engelhard, Jr. & Jue Wang 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
Introduction to Many-Facet Rasch Measurement (Facets), Thomas Eckes 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 Appliquer le modèle de Rasch: Défis et pistes de solution (Winsteps) E. Dionne, S. Béland
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Facets Tutorials - free		 Many-Facet Rasch Measurement (Facets) - free, J.M. Linacre Fairness, Justice and Language Assessment (Winsteps, Facets), McNamara, Knoch, Fan
Other 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
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Coming Rasch-related Events
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May 16 - June 20, 2025, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
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