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On the Evaluation of Percentage Change: Control Versus Treatment Groups

Summary: Experimenters faced with the task of evaluating the effect of a treatment frequently must determine the significance of the percentage change observed for a treatment mean relative to the mean of a control. A common error is to treat the mean of control data as a constant rather than a random variable. This error is explored, and a procedure handling such a comparison is presented.

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  • Topics:
  • Keywords: Control factors,Analysis of variance (ANOVA),Standard errors,Statistical methods,Health care
  • Author: McLean, Robert A.; Welch, Bruce L.
  • Journal: Journal of Quality Technology