Examples of sites which employ ratings scales are IMDb, Epinions.com, Yahoo!
Movies, Amazon.com, Board Game Geek and which use a rating scale from 0 to 100 in order to obtain "personalised film recommendations".
The above issues are compounded, when aggregated statistics such as averages are used for lists and rankings of products. While it is not uncommon to calculate averages or means for such data, doing so cannot be justified because in calculating averages, equal intervals are required to represent the same difference between levels of perceived quality.
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Often, only the top and bottom category is described, such as on IMDb's online rating facility.
More than one rating scale question is required to measure an attitude or perception due to the requirement for statistical comparisons between the categories in the polytomous Rasch model for ordered categories.
Rating scales are used widely online in an attempt to provide indications of consumer opinions of products.
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A rating scale is a set of categories designed to elicit information about a quantitative or a qualitative attribute.