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We assessed the response category threshold ordering by visually checking for disordered thresholds.
For uniformity, all 12 muscle groups were rescored to four response options, thereby restoring threshold ordering.
Appropriateness of the response categories (threshold ordering) was also examined [ 22].
In addition the process of Rasch analysis also allows for an investigation of polytomous item threshold ordering and Differential Item Functioning (DIF).
Our results suggested that the WHOQOL-BREF exhibited the expected threshold ordering among the five categories and low item dependence for a sample of heroin users.
A trial rescoring improved the threshold ordering but the overall fit worsened, therefore the category structures of these items were not re-scored.
Each set of items was assessed for threshold ordering, overall model fit, item fit, person fit, reliability, differential item functioning, targeting and dimensionality.
The rating scales revealed almost expected patterns of responses, and the threshold ordering for two of three rating scales displayed acceptable results.
Less frequently used IRT applications were the evaluation of local independence, the threshold ordering of items, and the measurement precision along the scale.
The threshold ordering analysis involves each category response for each POES item and shows whether or not an ordered set of response thresholds (distance across items across the trait) is present.
The threshold ordering for two of the rating scales displayed acceptable results, but the rating scale "not at all" to "extremely" displayed disordered thresholds between response category 2 and 3.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com