2.5 Summary
■ Data sets are made up of data objects. A data object represents an entity. Data objects are described by attributes. Attributes can be nominal, binary, ordinal, or numeric.
■ The values of a nominal (or categorical) attribute are symbols or names of things, where each value represents some kind of category, code, or state.
■ Binary attributes are nominal attributes with only two possible states (such as 1 and 0 or true and false). If the two states are equally important, the attribute is symmetric; otherwise it is asymmetric.
■ An ordinal attribute is an attribute with possible values that have a meaningful order or ranking among them, but the magnitude between successive values is not known.
■ A numeric attribute is quantitative ...
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