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Title: Two-stage control charts for high yield processes
Authors: Chan, L.Y.
Xie, M. 
Goh, T.N. 
Keywords: Control limits
Cumulative count of conforming chart
High-yield processes
Statistical process control
Two-stage control chart
Issue Date: 1997
Citation: Chan, L.Y.,Xie, M.,Goh, T.N. (1997). Two-stage control charts for high yield processes. International Journal of Reliability, Quality and Safety Engineering 4 (2) : 149-165. ScholarBank@NUS Repository.
Abstract: In this paper, a two stage control chart for monitoring the defective rate of high-yield processes is proposed and studied. The Cumulative Count of Conforming control chart is generalized by using the number of items inspected until two defective items are observed. As this will increase the time to alarm, a two-stage approach combining both schemes is proposed. The occurrence of a defective within n1 items inspected in the first stage indicates that the process is out of control. If no defective occurs within n1 items inspected, the occurrence of two defectives within the next n2 - n1 in the second stage also indicates that the process is out of control. The probability of making a false alarm at the first and second stages are equal to α1 and α2 respectively. This procedure improves the sensitivity of the control chart in detecting shifting of the process defective rate p when p is at the parts-per-million order of magnitude. © World Scientific Publishing Company.
Source Title: International Journal of Reliability, Quality and Safety Engineering
ISSN: 02185393
Appears in Collections:Staff Publications

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