Nominal variables By Jim Frost Nominal variables have at least three categories and there is no natural order to these categories. For example, science fiction, drama, and comedy are nominal data. Related Related Articles: 5 Steps for Conducting Scientific Studies with Statistical AnalysesChoosing the Correct Type of Regression AnalysisGuide to Data Types and How to Graph Them in StatisticsGlossary: Nominal logistic regressionDiscrete vs. Continuous Data: Differences & Examples