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To prepare data for principal component analysis and item reduction, items were checked for inter-item correlation, as this would suggest redundancy.
It is also the case that proposed service reduction items are not necessarily 'bad' in their own right, and indeed may be producing some value (e.g., option X above, having received a score of 80/100, obviously has merit).
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Third, an expert panel consisting of a child psychiatrist, research psychologists and a statistician reviewed the results and discussed item reduction; which items should remain, be further modified, and those to be removed (item reduction and clarification).
Development was a multi-stage process including item development, item reduction using item-response theory (IRT), psychometric testing and external validation, and assessment of clinical utility.
After literature review, an expert consensus group drawn from all six world regions formulated HURT through item development and item reduction using item-response theory.
For item reduction both item psychometric properties and conceptual importance were taken into consideration in making retention/deletion decisions for the initial potential pool of 60 items.
Through the empirical item reduction process, 13 items were selected from the 37-item pool generated during qualitative development.
Rasch modeling was used to facilitate item reduction by selecting items which were free of DIF and fitted model expectations.
Study one focused on the generation and reduction of items for the BI-AAQ and a demonstration of construct validity.
The results of this study led to a reduction of items.
The use of experts is considered an important method for the reduction of items.
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