Page 193 - Contributed Paper Session (CPS) - Volume 6

CPS1870 Longcheen H. et al.
effective comparison among different charting schemes. The question that
how many IC Phase I profiles are needed to make the charting scheme based
on them to have the actual ARL0 equal to the nominal level has been raised.
To partially answer this question, a commonly accepted criterion will be
employed to find the minimum number of IC Phase I profiles that causes the
charting scheme based on these profiles to have its actual ARL0 close to the
nominal level. The rest of the talk is organized as follows. A brief introduction
of spatial rank-based EWMA charts for monitoring multivariate data is given
in Section 2. The proposed method that uses the spatial rank-based regression
for monitoring linear profiles is developed in Section 3. The performance
comparisons for the proposed multivariate EWMA chart using the spatial rank
and the competing counterpart based on the multivariate sign for monitoring
linear profiles are provided in Section 4. An example used to illustrate the
applicability and implementation of the proposed chart is presented in Section
5. Discussions and conclusions are included in the last section.

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