The Difference Between Repeats and Replicates in DOE


presented by Patrick Whitcomb

For a heads-up on this tricky issue, consider this advice from consultant Pat Whitcomb for FAQ #1 in the November 2004 DOE FAQ Alert: "Another question might be can I repeat the measurement rather than replicate the DOE run? The answer is yes, but in this case you enter the average of the repeated measures, not the individual results. Independent measurements will reduce the measurement system component of the total process variation...Only with knowledge of the variance components and the costs of replicating the DOE run and/or repeating the measure can one decide which is the best option."