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A Comparison between Robust z and 0.3-Logit Difference Procedures in Assessing Stability of Linking Items for the Rasch Model
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Huynh, Huynh; Rawls, Anita – Journal of Applied Measurement, 2011
There are at least two procedures to assess item difficulty stability in the Rasch model: robust z procedure and "0.3 Logit Difference" procedure. The robust z procedure is a variation of the z statistic that reduces dependency on outliers. The "0.3 Logit Difference" procedure is based on experiences in Rasch linking for tests…
Descriptors: Comparative Analysis, Item Response Theory, Test Items, Difficulty Level