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Rating scales had a simple question format, with categories that included frequency, severity and global ratings.
Developers of PRO instruments should use a simple question format, fewer (four to five) and labelled response categories.
Use a simple question format.
The VAQ has items with simple question format (e.g. item 10; "I have trouble reading the menu in a dimly lit restaurant") and non overlapping categories ("never, rarely, sometimes, often and always").
With a simple question format (e.g. item 1: "do you have difficulty recognising people's faces because of trouble with your eyesight?") and the five-category option, the VSQ demonstrated a large scale range (6.50 logits), however, response categories showed some unevenness (high SD, 0·91).
The Visual Function and Quality of Life (VF&QOL) questionnaire with a simple question format ("In general, would you say your vision (with glasses, if you wear them") and four response categories ("very good, good, fair and poor") had large scale range (6.20 logits) and very even categories (SD, 0.15).
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BioStar's success can be attributed to its well-defined scope and focus on a simple question and answer format for bioinformatics.
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.
He argues that the simple question-and-answer format fails to register a lot of serious health conditions.
Instead of producing finalized materials, develop prototype scripts and drafts of materials and ask children simple questions about the format, style, interest and comprehension.
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.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com