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Noise (Nuisance Factor)

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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.