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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
English Wikipedia - The Free Encyclopedia
Level of measurement or scale of measure is a classification that describes the nature of information within the numbers assigned to variables. The best known classification is that developed by the psychologist Stanley Smith Stevens, who proposed four levels, or scales, of measurement: nominal, ordinal, interval, and ratio. Other classifications include those by Chrisman and by Mosteller and Tukey. This framework of distinguishing levels of measurement originated in psychology and is widely criticized by scholars in other disciplines.

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