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Popular pages
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Institute for Objective Measurement
We are pleased to share the publication of Rasch Measurement Theory Analysis in R. This book provides researchers and practitioners with a step-by-step guide for conducting Rasch measurement theory a...
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ERP 9:1 Issues in the Fit of Data to Psychometric Models
Issues in the Fit of Data to Psychometric Models The correspondence between a data set and a statistical model defines the notion of `fit'. In psychometric models of the Rasch class, all aspects of fi...
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Rasch Analysis is Important to Understand and Use for Measurement
Rasch Analysis is Important to Understand and Use for Measurement In measurement, our intent is to use numbers (which are really raw scores/ratings) to indicate "more" or "less" of the trait that is p...
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Rasch Measurement Transactions Contents and Archives
Note from Rasch SIG Chair. J. Tognolini Rasch Measurement Transactions, 2016, 29:4 p. 1550 Association of Rasch Person Reliability with Cronbach's Alpha, Ferguson's Delta and Gini Coefficients. T.-...
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DIF matters: A practical approach to test if Differential Item Functioning makes a difference
DIF matters: A practical approach to test if Differential Item Functioning makes a difference Differential Item Functioning (DIF) in psychometric tests has long been recognized as a potential source ...
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Critical Eigenvalue Sizes (Variances) in Standardized Residual Principal Components Analysis (PCA)
Critical Eigenvalue Sizes (Variances) in Standardized Residual Principal Components Analysis (PCA) A principal components analysis PCA, of Rasch residuals, i.e., of observed responses minus their expe...