Supplementary Variable

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A variable in an experiment that is neither the Outcome Variable nor a Predictor Variable and is typically not of direct interest to the researcher.

Also known as

  • Nuisance variable.
  • Auxiliary variable.
  • Covariate (although this is also used as a synonym for Predictor Variable).
  • Concomitant variable (although this is also used as a synonym for Predictor Variable).