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When a simple IRT model does not fit the data, one could consider deleting or changing bad fitting items, and/or deleting bad fitting persons.
Usually, re-engineering of questionnaires involves removal of poorly fitting items to make a shorter questionnaire, although Velozo et al actually added items to the VF-14 and yet were unable to completely satisfactorily improve the instrument [ 36].
Exploratory principal components and item response theory analyses identified only a few poor fitting items.
Two of the poorest fitting items were from the family and close relationships domain and one from the leisure domain.
An important selection method compared to other shoulder measures was Rasch analysis, which revealed redundant and not fitting items to the unidimensional construct of shoulder function.
Subsequently a subtest analysis of the whole PSOCQ scale was performed by creating subtest of the fitting items in each subscale.
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In relation to fit, items with an infit mean square close to 1 are optimal, although some variation is necessary [ 20].
Look for items that don't fit, items that have gone out of style, items with stains or other signs of wear, and items that you just don't wear very often.
Small items can be choking hazards, so bring an empty toilet paper roll to fit items through if it fits without touching the sides it is a choking hazard.
Item fit, item stability, coverage of item content and person measure (item-person map), and item targeting were evaluated.
After refinement through several expert panels, the remaining items were used as the basis for adapting items and/or formulating new items fitting the EORTC item style.
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