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JMP 12 Profilers by SAS Institute

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Chapter 9 
Noise Factors
Minimize Noise Variation to Create a Robust Process
Robust process engineering enables you to produce acceptable products reliably, despite variation in the process variables. Even when your experiment has controllable factors, there is a certain amount of uncontrollable variation in the factors that affects the response. This is called transmitted variation. Factors with this variation are called noise factors. Some factors you cannot control at all, like environmental noise factors. The mean for some factors can be controlled, but not their standard deviation is not controllable. This is often the case for intermediate factors that are output from a different process or manufacturing step.
A good approach to making ...

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