Anchor output file = " "
When Anchorfile= is specified, Facets writes out a new specification file containing the input specifications for this analysis. This file omits any specifications entered as extra specifications, but includes the final estimated measures for all elements and scales. This file also has all estimated measures marked as ",A" for "anchored".
These anchor values can be used as starting values for slightly different later runs. Edit the ",A"'s out of the first line of each facet in the Labels= specifications and out of the category lines of Rating (or partial credit) scale=.
Example: Using an edited version of Guilford.txt.
Title = Ratings of Scientists (Psychometric Methods p.282 Guilford 1954)
Score file = GUILFSC ; score files GUILFSC.1.txt, SC.2.txt and SC.3.txt produced
Facets = 3 ; three facets: judges, examinees, items
Inter-rater = 1 ; facet 1 is the rater facet
Arrange = m,2N,0f ; arrange tables by measure-descending for all facets,
Positive = 2 ; the examinees have greater creativity with greater score
Non-centered = 1 ; examinees and items are centered on 0, judges are allowed to float
Unexpected = 2 ; report ratings if standardized residual >=|2|
Usort = (1,2,3),(3,1,2),(Z,3) ; sort and report unexpected ratings several ways (1,2,3) is Senior, Junior, Trait
Vertical = 2N,3A,2*,1L,1A ;define rulers to display and position facet elements
Zscore = 1,2 ;report biases greater in size than 1 logit or with z>2
Pt-biserial = measure ; point-measure correlation
?B,?B,?,RS1,1 ; CREATIVITY
Rating (or partial credit) scale = RS1,R9,G,O ; CREATIVITY
; Facets has renamed the rating scale in order to avoid ambiguity. Please edit the rating-scale name in the Anchorfile if you wish.
1=lowest,0,A ; this is a place-holder for the bottom category
; Rasch-Andrich Thresholds = 0, -.6441868 ,-2.317694 ,.8300989, -1.477257 ,1.710222 ,-1.001601 ,2.358206 .5422113
Example 1: Two time points and a rating scale:
(1) Obtain the common structure for the rating scale:
Construct the entire data set. Put in a dummy "time-point" facet with the two elements anchored at 0.
If the same person appears twice, then give them two related id-numbers, so that they are easy to pair up later. Analyze the dataset. Write out an Anchorfile=
(2) Time-point 1 is the "gold standard":
For the time-1 data, edit the Model= statements for element 1 of the time-point facet.
Copy-and-paste into the specification file the parts you want to anchor from the (1) anchor file.
Analyze the time-1 data and output another anchorfile.
(3) Time-point 2 is measured in the Time-point 1 "frame of reference":
For the time-2 data, edit the Model= statements for element 2 of the time-point facet.
Copy-and-paste into the specification file the parts you want to anchor from the (2) anchor file.
Analyze the time-2 data.
Example 2: I want generate a report for each criterion entered in the analysis. I am interested in getting fair averages for the different criteria used by the raters.
1. Perform the complete analysis.
2. Output an Anchorfile=
3. In the Anchorfile=, keep everything anchored but comment out all except one criterion.
4. Analyze the Anchorfile=.
Now all the reporting will be for only that one criterion.
5. Return to 3. for the next criterion.
Example 3: Fair Average score for Item-by-Candidate combinations.
i.Do a standard analysis:
Facets = 3 ; Candidates, Raters, Items
Non-centered = 1 ; candidates - we need this
Model = ?, ?, ?, R
Anchorfile = anc.txt ; we need this
Edit the model specification:
Model = ?, X, ?, .... ; inactivates the raters
Residual file = residual.xls ; Excel file - we need this
iv.Open Residual.xls ; in Excel
Delete all columns except: Candidate, Item, Expected score
Sort the file: Candidate major, Item minor.
All the expected scores for each candidate-item combination should be the same
Used the Excel "Advanced filter" to remove duplicate lines.
v.The "expected score" is the "Fair Average score for Item-by-Candidate"
Help for Facets Rasch Measurement Software: www.winsteps.com Author: John Michael Linacre.
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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|
|Jan. 5 - Feb. 2, 2018, Fri.-Fri.||On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com|
|Jan. 10-16, 2018, Wed.-Tues.||In-person workshop: Advanced Course in Rasch Measurement Theory and the application of RUMM2030, Perth, Australia (D. Andrich), Announcement|
|Jan. 17-19, 2018, Wed.-Fri.||Rasch Conference: Seventh International Conference on Probabilistic Models for Measurement, Matilda Bay Club, Perth, Australia, Website|
|Jan. 22-24, 2018, Mon-Wed.||In-person workshop: Rasch Measurement for Everybody en español (A. Tristan, Winsteps), San Luis Potosi, Mexico. www.ieia.com.mx|
|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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