On the Evaluation of Percentage Change: Control Versus Treatment Groups

Article

McLean, Robert A.; Welch, Bruce L.   (1971, ASQC)   The University of Tennessee, Knoxville, TN; Maryland State Psychiatric Research Center, Baltimore, MD

Journal of Quality Technology    Vol. 3    No. 4
QICID: 5088    October 1971    pp. 156-158
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Article Abstract

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.

Keywords

Control factors,Analysis of variance (ANOVA),Standard errors,Statistical methods,Health care


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