Needs Must ...

Question: "I have been told that I should not use Rasch methods on my rating-scale data because the leading ... journal is only accepting papers that employ 2 parameter models. Here's my solution. I'll buy a 2 parameter package that lets me set the slope parameter to 1, thus making it a Rasch model. I'll run the models both ways (2 and 1 parameters) and show that the differences are not meaningful. Is this possible? If so, can you recommend the 2 parameter package that will work the best towards achieving this goal?"
K.W.

Answer: "Value depends entirely on utility" stated Jevons, but even the most useful methodology is useless if its findings can't be published! So we conform, while muttering to ourselves, "Eppur si muove" ("Yet it does move", Galileo Galilei). Yes, your strategy has merit. It should work, and could yield two papers, one substantive, the other methodological. As for software, Parscale may be your only choice (RMT 13:2 p. 709, www.rasch.org/rmt/rmt133l.htm). And please tell us how this all works out!

Jevons W.S. (1871) The Theory of Political Economy. 1957:1.

Needs Must ... Linacre J.M. … 15:4 p. 850


Needs Must ... Linacre J.M. … Rasch Measurement Transactions, 2002, 15:4 p. 836



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: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr. 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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