IPMATRIX= response-level matrix (from Output Files menu only)

IPMATRIX= is only available from the Output Files pull-down menu. It constructs a rectangular matrix in which there is one row for each person and one column for each item, or vice-versa. The entries in the matrix are selected from the following screen:

 

 

The first rows and columns can be the entry numbers, measures, labels and/or fields from the labels.

 

The matrix contents are selected from the "Select the field you want" pull-down menu (red arrow above). The identifying numbers in the drop-down list are those for XFILE=.

 

 

The "Person Label field" and "Item Label field" boxes enable you to select columns from the person and item labels to use as demographics. These can be typed in or chosen from the pull-down menu.

 

Depending on CSV=, data values are separated by "tab" or comma characters. In fixed field format, all fields are 7 characters long, separated by a blank. Missing data codes are "." as standard, but can be any character, or nothing.

 

Example:

 

"Entry"       1       2       3       4  <- Item entry numbers

     1    .162    .162       .    .482  <- standardized residuals. "." is missing or inestimable data

     2    .042    .042    .044    .126

     3    .042    .042    .044    .126

     4    .225    .225    .236    .671

     5    .042    .042    .044    .126

     6    .042    .042    .044    .126

     7    .006    .006    .006    .017

     8    .042    .042    .044    .126

     9    .042    .042    .044    .126

        ^

        Person entry numbers


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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
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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

 

 

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