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b i item difficulty, SE standard error.
p: person effect, i: item effect, p × i: person-by-item interaction effect.
Reference item (i), item with a sufficiently large score-value (see text) of which changes are followed.
The scales' and items' Loevinger's coefficients (H and Hi respectively) were considered acceptable if H > 0.3 (high degree of homogeneity of the set of items) and Hi > 0.3 for all i (item consistent with the set of items).
They also give criteria to choose the "cleanest solution": i) item loading above.30, ii) no or few item crossloading and iii) no factors with fewer than three items.
Methods: the study was articulated in the following four stages: (i) Item generation based on literature review, sarcopenic subjects' opinion, experts' opinion, focus groups; (ii) Item reduction based on sarcopenic subjects' and experts' preferences; (iii) Questionnaire generation developed during an expert meeting; (iv) Pretest of the questionnaire based on sarcopenic subjects' opinion.
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A larger proportion of responders chose the best response option for FES-I item 3 (Preparing simple meals) and mSAFFE items 4 (Go to the doctor/dentist), 6 (Take a shower) and 12 (Walk around indoors) (data available on request).
A PCA on PAM13-I items was conducted with this aim (Table 3).
As shown in Table I, item-generation involved four stages: generating potential items; eliminating redundant, irrelevant and outlier items; validation among people with fertility problems, and cross-cultural survey of acceptability and feasibility.
Overall, the item analysis resulted in the removal of 4 I items, 9 A items and 11 P items.
Component I, items referring to psychotic experiences; Component II, remaining items.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com