[Rasch] More on the Rasch model

David Andrich david.andrich at uwa.edu.au
Thu Nov 1 17:16:10 AEDT 2018

Colleagues might be interested in the paper which has just come out.

Andrich, D. & Pedler, P. (2019) A law of ordinal random error: the Rasch measurement model and random error distributions of ordinal assessments. Measurement. 131, 771-781. Reference:

In the paper we show an analogy between the Gaussian (Normal) distribution as a random error distribution of replicated measurements and the Rasch measurement model distribution for a polytomous item as a random error distribution of ordinal assessments. The analogy is both in terms of the mathematical properties as well as the general principles.

All the best


David Andrich, BSc MEd W.Aust., PhD Chic, FASSA
Chapple Professor david.andrich at uwa.edu.au<mailto:david.andrich at uwa.edu.au>
  Graduate School of Education
The University of Western Australia
M428, 35 Stirling Highway,
Crawley, Western Australia, 6009
Telephone: +61 8 6488 1085;   Fax: +61 8 6488 1052

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