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In order to explore the contribution of items to the internal consistency we also calculated item-corrected total score correlations for each scale, as well as the alpha coefficient were a given item to be eliminated.
No items needed to be eliminated from the other two scales.
As a result of the RA of the Health Promotion Willingness scale, Item 3 had to be eliminated because its item total correlation did not achieve the threshold value of 0.50 [Additional file 2].
The resultant items may then be explored empirically through item analysis, enabling poor items to be identified and eliminated from the final measure.
Here, subjects need to retain maximum possible information in their WM until it becomes clear which items should be eliminated from WM to free attentional and memory resources.
In such conditions, subjects need to retain maximum possible information in their WM until it is clear which items should be eliminated from WM to free attention and memory resources.
Extremely high values can call into question whether scale items could be eliminated because of redundancy.
These results suggest that none of the 19 items should be eliminated.
Exploratory factor analysis of the questionnaire showed that items could be eliminated and still have a good amount of shared variance and sufficient coverage of each concept.
Accordingly, eight items were eliminated, leaving 13 items to be examined further.
Items with ambiguous meanings can be eliminated to maximise the reliability and validity of the questionnaire.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com