A review and critique of auxiliary information-based process monitoring methods

  title={A review and critique of auxiliary information-based process monitoring methods},
  author={Nesma A. Saleh and Mahmoud A. Mahmoud and William H. Woodall and Sven Knoth},
  journal={Quality Technology \& Quantitative Management},
We review the rapidly growing literature on auxiliary information-based (AIB) process monitoring methods. Under this approach, there is an assumption that the auxiliary variable, which is correlated with the quality variable of interest, has a known mean, or some other parameter, which cannot change over time. We demonstrate that violations of this assumption can have serious adverse effects both when the process is stable and when there has been a process shift. Some process shifts can become… 
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