Modify Design - Replicate
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Stat > DOE > Modify Design > Replicate design

You can add up to ten replicates of your design. When you replicate a design, you duplicate the complete set of runs from the initial design. The runs that would be added to a two factor full factorial design are as follows:

True replication provides an estimate of the error or noise in your process and may allow for more precise estimates of effects.

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Number of replicates to add: Choose a number up to ten.