What types of scales of measurement are suitable for non-parametric tests?

  • Nominal, ordinal, interval, and ratio
  • Only interval and ratio
  • Only nominal and ordinal
  • Only ratio
Non-parametric tests can be used with nominal, ordinal, interval, and ratio scales of measurement. This is one of the reasons why non-parametric tests are sometimes chosen over parametric ones, as they can handle data that are not interval or ratio (which are required for many parametric tests).
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