Exact(3)
For this purpose only qualitative data of the network is required, i.e., sign of interactions (+ or −), threshold order and weights for each interaction.
Rasch analysis consists of the following components: category threshold order, person separation, unidimensionality, targeting, and differential item functioning (DIF).
Items were also analysed by means of an ordinal Rasch model in order to identify violations of threshold order of the response scale.
Similar(57)
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].
The Rasch analysis can be used to see if items are categorised correctly and threshold ordering was considered for this purpose.
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.
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