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The items are calibrated by their difficulty levels from the item bank.
Since all of the items are calibrated, the measurements remain comparable.
In Rasch analyses, both persons and items are calibrated on the logit scale and this enables an evaluation to be made of how well-targeted the items are for the persons in the sample.
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Scale items were calibrated in the development sample with the Graded Response Model and the results were used to construct a 10-item short form.
Items were calibrated and subjects were scored using the Partial Credit Model [ 39].
The items were calibrated on a large sample of people with arthritis.
In order to allow comparison of locations across scales, the 82 items were calibrated on the same metric.
Each item was calibrated using chi-squared fit statistics to assess its contribution to the composite health score.
The CAT-process (cf. Fig. 1) requires that all items of an item pools are calibrated by administering them to examinees with the intent to estimate the associated item parameters in a pre-testing phase.
Furthermore, they can be used in differential item functioning, in order to assess why items that are calibrated and test, still behave differently among groups.
Extending the measurement range can be achieved without affecting the scales as they stand, because the item locations are calibrated relative to each other.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com