COMET, a monthly meeting of objective measurement specialists,
began in November, 1993 on the University of Chicago campus. In
Spring 1997, it moved downtown to the Rehabilitation Institute of
Chicago. COMET participants
present preliminary results from projects,
describe unusual applications of measurement,
introduce innovations in reporting results,
seek advice on specific measurement problems, and
try out presentations planned for other audiences.
The meetings are usually held on the third of the month Thursday and start at 4:00 P.M. They are open to everyone without fees or registration. After the planned program, COMET typically moves to a neighborhood restaurant for dinner. To attend COMET or present a paper, contact Rita Bode
Several meetings addressed the issue of equating instruments measuring physical functioning. Richard Smith (RFI/Marianjoy Rehabilitation Institute) discussed the consolidation of the MOS SF36 and the LSU HSI Physical Functioning Scales. Michael Linacre (MESA), Rita Bode and Allen Heinemann (both from Rehabilitation Institute of Chicago) showed the influence that category structure in rating scales has on item difficulty estimates. Rita Bode presented an example from the SF36, demonstrating the benefits of aligning rating scale structures using "pivot anchoring" to establish meaningful item difficulties.
Donna Tatum (Meaningful Measurement) described development of a Competency Map: An item bank for speech evaluation for public speaking that crosses eight public speaking content domains (credibility, vocal, nonverbal, language, topic/structure, evidence/support, audience, and motivated sequence), yet is encompassed by one measurement framework.
Tom O'Neill (American Society of Clinical Pathologists) presented his study of item security when the item selection algorithm in a computerized adaptive test is allowed to present examinees with questions already presented in a previous CAT administration. His results show item security is not breached when some previously seen questions are administered to some repeating examinees.
In a Comparison of performance on written and oral examinations, Mary Lunz (American Society of Clinical Pathologists) reported the relationship between written and oral performance on a certification examination in a medical specialty. Some candidates who did very well on the written examination were unable to demonstrate adequate clinical skills on the oral. There was also substantial variation among candidates who performed moderately well on both examinations. Since these examinations are designed to test different skills, these results were reassuring.
Matthew Schulz (American College Testing) presented Performance of optimal tests for Pass/Fail decisions addressing the consistency and accuracy of classification in the presence of off-target items in multiple-choice tests. These items introduce noise, so reducing classification accuracy. For examinees with low-borderline ability on a test he investigated, maximum accuracy and reliability could be attained with as few as four out of the thirty test items.
In Predicting College Football Point Spreads, Patrick B. Fisher (Rehabilitation Institute of Chicago) presented empirical results showing the increased precision that Rasch analysis gives him in predicting NCAA football point spreads. COMET participants suggested many further refinements, and also uses for these results.
|Schedule for Fall 1998 - Winter 1999 COMET Meetings|
|September 17||Betty Bergstrom||Testing on the Internet|
|October 29||Chih-Hung Chang||QOL item banking and CAT|
|November 19||Mary Lunz||Facets and Oral Examinations|
|December 17||Richard Smith||Equating polytomous scales|
|January 21||Winnie Lopez||Understanding midpoint responses|
|February 18||Mark Stone||Item/person validity|
|March 18||Greg Stone & Jeff Mosenkis||Validating content by traditional and paired approaches|
Bezruczko N. (1998) Chicago Objective Measurement Table. Rasch Measurement Transactions 12:1 p. 620.
Chicago Objective Measurement Table. Bezruczko N. Rasch Measurement Transactions, 1998, 12:1 p. 620.
|Rasch Measurement Transactions (free, online)||Rasch Measurement research papers (free, online)||Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch||Applying the Rasch Model 3rd. Ed., Bond & Fox||Best Test Design, Wright & Stone|
|Rating Scale Analysis, Wright & Masters||Introduction to Rasch Measurement, E. Smith & R. Smith||Introduction to Many-Facet Rasch Measurement, Thomas Eckes||Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr.||Statistical Analyses for Language Testers, Rita Green|
|Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar||Journal of Applied Measurement||Rasch models for measurement, David Andrich||Constructing Measures, Mark Wilson||Rasch Analysis in the Human Sciences, Boone, Stave, Yale|
|in Spanish:||Análisis de Rasch para todos, Agustín Tristán||Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez|
|Forum||Rasch Measurement Forum to discuss any Rasch-related topic|
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Go to Institute for Objective Measurement Home Page. The Rasch Measurement SIG (AERA) thanks the Institute for Objective Measurement for inviting the publication of Rasch Measurement Transactions on the Institute's website, www.rasch.org.
|Coming Rasch-related Events|
|Oct. 9 - Nov. 6, 2020, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Jan. 22 -Feb. 19, 2021, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|May 21 -June 18, 2021, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 25 - July 23, 2021, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|Aug. 13 - Sept. 10, 2021, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith,Facets), www.statistics.com|
|June 24 - July 22, 2022, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
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