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In the following section, we thus focus on demonstrating the flexibility of the platform in terms of administering item types that differ in content presentation as well as form and amount of user interaction required when providing answers.
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However, administering items using a pretest is costly, and there is a risk of exposing the items before they are used for a real test.
The fundamental idea of curtailment is to avoid administering items that have no bearing on the respondent's final result from the questionnaire.
A limitation of the present study was that we did not actually administer item 7 or the 4 items of the BHS individually.
After the adminstration of an item, the theta values not only changed on the dimension of the administered item, but also on the other two dimensions.
This article illustrates the working mechanism of our CAT in a sample of patients with RA by showing each administered item together with the related response, theta and measurement precision per dimension and per person.
In the Excel files, the following data were stored: each administered item, the given answer, the estimated level of fatigue (theta-value) on each of the three dimensions and the respective standard error on each of the three dimensions.
We calibrated a PF item bank via item response theory (IRT), administered items with a post hoc CAT design, and determined whether CAT would improve accuracy and precision of score estimates over random item selection.
An item that exhibits DIF can also have large repercussions in a CAT since the sequence of administered items to the respondents in part is dependent on their responses to that item (Makransky and Glas 2013).
This comprises the management of the item pool and storing all information necessary to carry out a test (e.g., storing the history of administered items and their answers).
The computerized adaptive testing iteratively administers items based on the participant's responses to previous questions and therefore the computerized adaptive testing requires very few items to provide a precise and accurate assessment of patient-reported outcome measures [24, 25].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com