Expected score |
This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4
The expected score for an element is the sum of the expected scores for each observation in which the element participates.
For the observation, M is the sum of the measures of the elements for the observation. Then, from
www.rasch.org/rmt/rmt122q.htm, the probability of observing a category for observation ni is:
and, and the score for an element is the sum of the expected scores for the L observations of the element:
For the rating-scale categories for the observation i are numbered b,..,t. Fb=0, and the other Fk are the Rasch-Andrich step thresholds. The denominator is the sum of the numerators for all categories, so that the sum of the probabilities across all categories is 1:
Expected score for a standard (zero) examiner/judge/rater
"Expected" means what we expect the observation or score to be based on the examiner, task, candidate, etc.
If you need the value of the expected observation when the examiner severity is zero, then do this:
1. Do your standard Facets analysis
2. Output an Anchorfile= with anchor values
3. In the Anchorfile=, "X" out the examiner facet in the Models= specification. Don't change anything else.
4. Use the anchor file as your Facets specification file
5. The "expected" values in the output will be for examiners at 0.
Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
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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 |
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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 |
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