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Noise (Nuisance Factor)

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Definition

Factors that vary uncontrollably within the process, but that can be controlled for the purposes of the experiment. Some examples of nuisance Factors are multiple vendors, machines, locations, room temperature/humidity, etc. Noise/nuisance Factors that cannot be controlled within the experiment but that can be measured are sometimes incorporated into the design as ‘covariates’ to control for their effect - e.g. Age.