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Definition of Nominal variable

Nominal variable Definition from Science & Technology Dictionaries & Glossaries
Electronic Statistics Textbook
Variables which take on one of a set of discrete values, such as Gender={Male, Female}. In neural networks, nominal output variables are used to distinguish classification tasks from regression tasks. See also, Grouping (or Coding) Variable and Measurement scales.
Common Concepts in Statistics
A qualitative variable defined by mutually exclusive unordered categories such as blood groups, races, sex etc. (see also ordinal variable).
Nominal variable Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In statistics and quantitative research methodology, levels of measurement or scales of measure are types of data that arise in the theory of scale types developed by the psychologist Stanley Smith Stevens. The types are nominal, ordinal, interval, and ratio.

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