UPMEAN = the mean or center of the person abilities = (computed)
Assigns your chosen numerical value to the average of the non-extreme abilities for persons (UEXTREME=No) or all persons (UEXTREME=Yes), i.e., this provides a norm-referenced user-scaling.
The last UIMEAN= or UPMEAN= values in the control file is actioned.
Example 1: You want to used conventional IRT norm-referenced user-scaling with person mean of 0 and person S.D. of 1.
UPMEAN = 0
USCALE = 1 / (person S.D. in logits) ; find this from Table 3.1
If there are extreme person scores, see User-friendly rescaling
Example 2: I want to compare the mean performance of random samples of examinees from my database. Will UPMEAN= help in this?
UPMEAN=0 sets the local mean of the persons to zero (excluding extreme scores) regardless of the sampling.
If you wish to investigate the behavior of the person mean for different person samples, then
(2) anchor the items using IAFILE=
(3) analyze samples of persons with the anchored items.
The person means reported in Table 3.1 now show person means (with or without extreme scores) in the one frame of reference across all analyses defined by the anchored items.
For more examples, and how to compute this by hand, see User-friendly rescaling
Item Easiness = 2*Mean Person Ability - Item Difficulty
For a full set of item easiness statistics, set the Mean Person Ability as the reference point, then reverse the user-scaling:
For the person ability statistics:
UEXTREME = Yes
UPMEAN = 0 or preferred reference value
USCALE = current value of USCALE=
For the matching item easiness statistics:
UEXTREME = Yes
UPMEAN = 0 or preferred reference value
USCALE = - current value of USCALE=
Help for Winsteps Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre
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Winsteps Rasch measurement software. Buy for $149. & site licenses. Freeware student/evaluation download
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|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 with Raters and Rating Scales: Rasch Models for Rater-Mediated Assessments, George Engelhard, Jr. & Stefanie Wind||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|
|Winsteps Tutorials||Facets Tutorials||Rasch Discussion Groups|
|Coming Rasch-related Events|
|April 10-12, 2018, Tues.-Thurs.||Rasch Conference: IOMW, New York, NY, www.iomw.org|
|April 13-17, 2018, Fri.-Tues.||AERA, New York, NY, www.aera.net|
|May 22 - 24, 2018, Tues.-Thur.||EALTA 2018 pre-conference workshop (Introduction to Rasch measurement using WINSTEPS and FACETS, Thomas Eckes & Frank Weiss-Motz), https://ealta2018.testdaf.de|
|May 25 - June 22, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|June 27 - 29, 2018, Wed.-Fri.||Measurement at the Crossroads: History, philosophy and sociology of measurement, Paris, France., https://measurement2018.sciencesconf.org|
|June 29 - July 27, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com|
|July 25 - July 27, 2018, Wed.-Fri.||Pacific-Rim Objective Measurement Symposium (PROMS), (Preconference workshops July 23-24, 2018) Fudan University, Shanghai, China "Applying Rasch Measurement in Language Assessment and across the Human Sciences" www.promsociety.org|
|Aug. 10 - Sept. 7, 2018, Fri.-Fri.||On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com|
|Sept. 3 - 6, 2018, Mon.-Thurs.||IMEKO World Congress, Belfast, Northern Ireland www.imeko2018.org|
|Oct. 12 - Nov. 9, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
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