Computations with Rasch Measures
Question: My school is thinking of using the AGS Reading-Level Indicator to measure the progress of our reading program (student growth). We have the W-ability (Rasch) table that accompanies this measure. We would like to know what kind of statistical manipulations would be appropriate to use with these numbers (t-tests, ANOVA, etc.).
Answer: Wonderful! Rasch measures are designed and intended for all those arithmetical and statistical operations which expect their numbers to obey the rules of addition and subtraction, such as the computations of means and standard deviations. In the classification of S. S. Stevens, Rasch measures are "interval".
Computations with Rasch measures, Rasch Measurement Transactions, 2004, 18:3 p. 994
|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|
|Forum||Rasch Measurement Forum to discuss any Rasch-related topic|
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