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How should I do to make smalller the unevennes?


Analysis of Causes of Errors is needed. If causes are complicated Propagation of Errors is also needed.

And knowledge of Errors and Sample Number is needed to evaluate the improvement of the unevenness.

If the factory is used for many years, Errors by Significant Figures may happens.

If you want to improve process capacity, improvement of the unevenness is not the only way. Other ways are written in Process Capacity page.