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5.
Process Improvement
5.2. Assumptions
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| Plan to examine process stability as a part of your experiment | Experimental runs should have
control runs which are done at the ‘standard’ process setpoints, or at
least at some standard operating recipe. The experiment should start and
end with such runs. A plot of the outcomes of these control runs will indicate
if the underlying process itself has drifted or shifted during the experiment.
It is desirable to experiment on a stable process. However, if this cannot be achieved, then the process instability must be accounted for in the analysis of the experiment. |
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