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A panel of subject matter experts is often used to improve content validity through refinement or elimination of items (Anastasi & Urbina 1997).
Alteration or elimination of items with undesirable psychometric characteristics could potentially both augment empirical support for the theoretical structure of the MSLQ and strengthen its subscales' predictive utility for academic performance.
Item-total correlations showed that all items were above 0.20 and that the elimination of items reduced the Cronbach's alpha (Table 4).
After the elimination of items not fulfilling the criteria specified in the "Item selection" section in the "Material and Methods" chapter, a further analysis reduced the total number of items to 40.
The elimination of items with low communality (h < 0.40) resulted in the exclusion of 10 items in all (items 2, 7, 8, 9, 11, 17, 18, 20, 22 and 25).
The most important modifications to the questionnaire that arose from this stage were 1) rearrangement of the sequence of items to make the interview more fluent, 2) rewording of questions, 3) addition of response categories, and 4) elimination of items that showed no variation.
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The analysis yielded the following results shown in table 3. Elimination of item S13 (Complete situation shameful) increased Cronbach α for factor 1 (.928 to.930).
The modifications that produce the QuickDASH-9 fulfil the original aims of the QuickDASH [ 20]: a shortened version of the full-length DASH with comparable or preferable psychometric properties, improved practicality and the elimination of item redundancy [ 9, 11].
In conclusion, and in accordance with Rule II-11 of the General Rules of the Organization, the Council recommended approval of the Provisional Agenda set out in C 63/1 - first draft, subject to the insertion of the additional item given in paragraph 6 above and the elimination of Item 17. 9.
The Council noted that the proposed elimination of Item 17 of the Provisional Agenda would make it possible for Commission II to initiate consideration of the Draft Program of Work and Budget half a day earlier than had been visualized in the proposed time-table in C 63/4 Rev.1.
The elimination of the items performing poorly on item-total correlation and principal factor analysis changed Cronbach's alpha by less than 1.5% and had minimal effect on the factor analysis outcome, indicating that the elimination of these items had little effect on the psychometric qualities of the questionnaire.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com