Example 2: Control and anchor files

A control file, EXAM2.TXT, for the analysis of a test containing 18 items, each item already scored dichotomously as 0,1. The person-id data begins in column 1 and the item-response string begins in column 11. The standard tables will be appear in the printout. There is user scaling. Items 2, 4, 6 and 8 are anchored at 400, 450, 550 and 600 units respectively, supplied in file EXAM2IAF.TXT Your data is in file EXAM2DAT.TXT:


; This file is EXAM2.TXT

 TITLE='KNOX CUBE TEST - ANCHORED'   ; the title for output

 NI=18               ; the number of items

 ITEM1=11            ; position of first response in data record

 NAME1=1             ; first column of person-id in data record



 DATA=EXAM2DAT.TXT   ; name of data file

 IAFILE=EXAM2IAF.TXT ; this is item anchor (input) file: it is the IFILE= of an earlier analysis

 CONVERGE=L          ; use only Logits for convergence criterion

 LCONV=.005          ; converged when biggest change is too small to show on any report.

; What follows is equivalent to the IAFILE= above

; IAFILE=*         ; item anchor file list

;2 400             ; item 2 anchored at 400 units

;4 450             ; item 4 anchored at 450 units

;6 550             ; item 6 anchored at 550 units

;8 600             ; item 8 anchored at 600 units

; *


 UIMEAN=500          ; user scaling - item mean

 USCALE=100          ; user scaling - 1 logit = 100 user units

 UDECIM=0            ; print measures without decimals


1-4                  ; item labels, starting with the first item



END NAMES            ; End of this file


The anchoring information is contained in file EXAM2IAF.TXT and contains the following lines, starting in column 1:


2 400 ; item 2 anchored at 400 units: 

      ; if logits are user-rescaled, then anchor values are also expected to be user-rescaled. 

      ; for logit anchor values, specify UASCALE=1

4 450 ; item 4 anchored at 450 units

6 550 ; item 6 anchored at 550 units

8 600 ; item 8 anchored at 600 units


Item calibration files, IFILE=, from prior runs can be used as item anchor files, IAFILE=, of later runs.


Your data is in the separate file, EXAM2DAT.TXT, with person-id starting in column 1, and item responses starting in column 11:


Richard M 111111100000000000

Tracie  F 111111111100000000


Elsie   F 111111111101010000

Helen   F 111000000000000000    End of this file

Help for Winsteps Rasch Measurement Software: www.winsteps.com. Author: John Michael Linacre

The Languages of Love: draw a map of yours!

For more information, contact info@winsteps.com or use the Contact Form

Facets Rasch measurement software. Buy for $149. & site licenses. Freeware student/evaluation download
Winsteps Rasch measurement software. Buy for $149. & site licenses. Freeware student/evaluation download

State-of-the-art : single-user and site licenses : free student/evaluation versions : download immediately : instructional PDFs : user forum : assistance by email : bugs fixed fast : free update eligibility : backwards compatible : money back if not satisfied
Rasch, Winsteps, Facets online Tutorials


Forum Rasch Measurement Forum to discuss any Rasch-related topic

Click here to add your email address to the Winsteps and Facets email list for notifications.

Click here to ask a question or make a suggestion about Winsteps and Facets software.

Rasch Publications
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 Winsteps & Facets Events
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
Oct. 12 - Nov. 9, 2018, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com



Our current URL is www.winsteps.com

Winsteps® is a registered trademark

John "Mike" L.'s Wellness Report: I'm 72, take no medications and, March 2018, my doctor is annoyed with me - I'm too healthy!
According to Wikipedia, the human body requires about 30 minerals, maybe more. There are 60 naturally-occurring minerals in the liquid Mineral Supplement which I take daily.