Levine (1982) used item-rest regressions for the
estimation of item parameters, and this relationship
was exploited in this research in the context of
vertical equating. Results from a simulation and an
empirical dataset were used to demonstrate that
item-rest regressions were useful in verifying the
relationship between two tests obtained from item
parameter estimates. It is shown that in vertical
equating designs the Rasch model cannot replicate
the relationship between tests at the lower score
levels when guessing is present. At higher score levels,
however, the correct transformation function
can be estimated, irrespective of the IRT model
used. Index terms: equating, guessing parameter,
item response functions, item-rest regression, Rasch
de Gruijter, Dato N & de Jong, John H. (1991). Item-rest regressions, item response functions, and the relation between test forms. Applied Psychological Measurement, 15, 25-34. doi:10.1177/014662169101500104
De Gruijter, Dato N. M.; De Jong, John H. A. L..
Item-rest regressions, item response functions, and the relation between test forms.
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