Modifying simple linear profiles monitoring schemes in phase II to detect decreasing step shifts and drifts
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- Amiri, A., Mehrjoo, M. & Pasek, Z.J. Int J Adv Manuf Technol (2013) 64: 1323. doi:10.1007/s00170-012-4103-6
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In profile monitoring, a relationship between a response variable and one or more explanatory variables is monitored. Different methods were developed for phase II monitoring of simple linear profiles. While some of the methods can be used to detect both increasing and decreasing shifts in the regression parameters, others need to be modified to enable detection of decreasing shifts in a process. In this paper, necessary modifications of the phase II methods for simple linear profile monitoring are proposed to improve their performance in detecting decreasing shifts. The paper also presents a performance comparison of several phase II methods.