Category sets are an optional feature you can apply to attributes (see Attributes with Category Sets). Use them to force Fathom to display categories in an order you determine, rather than alphabetically (such as "low," "medium," "high"); to display categories not represented in your collection (no one picked "musicals" as their favorite movie type in a survey); to treat a numeric attribute as categorical (so that Census_Year in U.S. microdata splits dot plots); and to help with data clean-up by flagging invalid values (because values not in the set appear in pink in case tables).
There are two places where you can create and manage category sets: a collection's Cases panel and its Categories panel (see Categories Panel). You can create a category set in the Categories panel; you can either create or apply a set in the Cases panel.
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