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We found that items with simple and uniform question format, four or five and labelled categories are most likely to be functional and often demonstrate characteristics such as hierarchal ordering, even utilization of categories and a good coverage of the latent trait under measurement.
The VDA demonstrated a superior rating scale performance which is likely due to the design features; an identical four-category format for all questions with conceptually spaces labels, and a simple and uniform question format [ 45].
The VDA follows a simple and uniform question format (e.g. item 4: To what extent, if at all, does your vision interfere with your ability to watch TV?) and categories ("not at all, a little, quite a bit and a lot") across all the items.
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Khadka et al. [ 61] examined the characteristics of functional ratings scales in a sample of adult participants on a surgical waiting list, and found that items with simple and uniform question formats and four or five labeled categories demonstrated functionality, hierarchical ordering and good coverage of the latent trait under measurement.
Specific data quality effects were also found with respect to variations in question format, where question-wise format performed better than alter-wise.
This question format, which we call LabLibs, is modeled after fill-in-the-blank questions.
The DCS has three versions, namely, statement format, question format, and low literacy.
Question format included reports and evaluations of patients' experiences; some questions comprised several items.
Five trial questions allowed participants to become familiar with the question format and test apparatus.
Question format ranged from closed questions with multiple choices to open comment and true/false type.
The phi (correlation) coefficient was used to compare criterion validity across question formats.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com