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The item difficulty parameter is standardized on a logarithmic interval scale, with a mean of 0 and a standard deviation (SD) of 1.
Given the Rasch model allows an adaptation to interval scaling, a nomogram giving the exchange rate between the raw score and latent interval scale estimate would have been useful.
GRM developed from IRT generally performs the best and most robust against skewness compared to other approaches (Chan 1996) and GRM is the item response model which is most often applied to an interval scale data (Lautenschlager, et al.
the Stratos series of multi-sided, bioptic scanner/scales featuring the new exclusive Mettler Toledo DIVA dual interval scale 2.