Measuring the elements

This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4

Facets commences by reading and checking the specifications. If it finds obviously faulty specifications, omissions or contradictions it will stop and display a diagnostic message on the screen.

 

When the specifications are successfully processed, it writes a summary of them to the output file. The less commonly used specifications are written to the file only if a non-standard option has been selected.

 

Facets then locates the data, which may be at the end of the specification file following the Data= line, or in a separate file (either the standard "FACETS.DAT" or one that you have named). As each datum is read from the data file, a matching Model= specification is sought. If one is found, the combined information is written to a work file. After this input phase is completed, a report is written detailing how many data points have been matched to each model statement.

Examine the Data Summary Report carefully. Unexpected counts are diagnostic of problems in the Model= specifications or data file. Precise details of thee matching process can be obtained by specifying "Query=Y".

If Pt-biserial=Y has been specified, a pass is made through the data calculating a point-biserial correlation corresponding to each element.

 

Initial estimates are obtained for each element using the PROX (normal approximation algorithm) method. Simultaneously, extreme scores are flagged, and the connectedness of the element structure is examined.

 

Facets then attempts joint unconditional maximum likelihood estimation for all unanchored element parameters of all facets. This is an iterative procedure, and progress towards convergence is shown on the screen.

 

The screen displays, for each iteration, the largest marginal residual score and largest logit change for any estimate encountered so far. Only amounts larger than convergence values are displayed.

 

The active horizontal bar-chart (>======<) shows how far through the data Facets has progressed in that iteration. To stop iteration prematurely, press the Ctrl+"S" keys simultaneously. The bar-chart changes symbol to (>######<) to acknowledge that you have forced termination at the end of this iteration. Complete output will be produced, as though convergence has been reached.

 

To cancel the program immediately, press Ctrl+C keys simultaneously. Output will consist only of what Facets has already produced. This can be useful for diagnosing problems with control specifications or data file contents. Immediate cancellation can cause Facets to leave its work files behind. Files with names starting "FACETS.$$_" are not needed and can be deleted.

 

After convergence is achieved or termination forced, a further iteration through the data is made to calculate fit statistics and write out residual information for the responses. The element parameter estimates and summary statistics are now written to the output file.

 

After estimating bias interactions, if specified, Facets concludes by reporting how long it took to complete the entire analysis.


Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
 

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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
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 Journal of Applied Measurement
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
May 17 - June 21, 2024, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 12 - 14, 2024, Wed.-Fri. 1st Scandinavian Applied Measurement Conference, Kristianstad University, Kristianstad, Sweden http://www.hkr.se/samc2024
June 21 - July 19, 2024, Fri.-Fri. On-line workshop: Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com
Aug. 5 - Aug. 6, 2024, Fri.-Fri. 2024 Inaugural Conference of the Society for the Study of Measurement (Berkeley, CA), Call for Proposals
Aug. 9 - Sept. 6, 2024, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com
Oct. 4 - Nov. 8, 2024, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
Jan. 17 - Feb. 21, 2025, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
May 16 - June 20, 2025, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 20 - July 18, 2025, Fri.-Fri. On-line workshop: Rasch Measurement - Further Topics (E. Smith, Facets), www.statistics.com
Oct. 3 - Nov. 7, 2025, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com

 

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