Example 9: Grouping and modeling items

A 20 item test. Items 1, 2 are dichotomous items, coded "Y", "N". Item 3 is a "Partial Credit" item. Items 4-10 are all ratings on one Andrich scale or test-level partial-credit scale (Grouping 1), and items 11-20 are all ratings on another Andrich scale or test-level partial-credit scale (Grouping 2). These are grouped with ISGROUPS=. Winsteps discovers from the data what the item structure is. Items 3-20 have response codes "A", "B", "C", "D", "E" or "a", "b", "c", "d", "e".


; This file is EXAM9.TXT

TITLE="Grouping and Modeling"

ITEM1=11  ; Item responses start in column 11

NI=20   ; There are 20 items

ISGROUPS=DD011111112222222222 ; The groupings in item order


CODES  = 10ABCDEabcde  ; Response codes to all items

IVALUED= 10**********  ; for Items 1 & 2

IVALUEA= **1234512345  ; for Items 3-20

DATA=EXAM9DAT.TXT   ; Location of data file

IWEIGHT=*    ; Item weighting file list

3 2.5     ; Item 3 has weight of 2.5



RD Prompt 1 ; Item id's remind us of MODELS= and ISGROUPS=

RD Prompt 2 ; MODELS= and ISGROUPS= are shown in item measure Tables 10, 13, 14, 15

S0 Logic

R1 Grammar 1

R1 Grammar 2

R1 Grammar 3

R1 Grammar 4

R1 Grammar 5

R1 Grammar 6

R1 Grammar 7

R2 Meaning 1

R2 Meaning 2

R2 Meaning 3

R2 Meaning 4

R2 Meaning 5

R2 Meaning 6

R2 Meaning 7

R2 Meaning 8

R2 Meaning 9

R2 Meaning 10



The data is in file EXAM9DAT.TXT:


Richard M 00bCDCDddCDddddCDccE

Tracie  F 00BcBABBccbBbbBbBBBb


James   M 00ccaBbabBAcbacbaBbb

Joe     M 10BdBBBBccBccbbccbcC

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

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 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



Our current URL is www.winsteps.com

Winsteps® is a registered trademark

Concerned about aches, pains, youthfulness? Mike and Jenny suggest Liquid Biocell