Journal
QUALITY ENGINEERING
Volume -, Issue -, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/08982112.2023.2223690
Keywords
Average run length; CUSUM chart; EWMA chart; statistical process monitoring; >
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Control chart performance is often measured using average run length or median run length. However, these measures do not indicate which method is more likely to signal first. We introduce the idea of "first to signal" to compare different charts based on this criterion.
Control chart performance is often measured using average run length or median run length, which gives the expected or median number of samples to signal. It is often argued that on average, one chart will signal a process change quicker than another, and is therefore a better choice. Average and median run length do not, however, answer the question of which method will be more likely to signal first. We introduce the idea of first to signal and compare charts based on this criterion.
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