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Double Sampling Charts

Summary: The purpose of this paper is to propose a new control chart, the double sampling chart, which is the counterpart to double sampling plans. This procedure offers better statistical efficiency (in terms of the average run length) than the Shewhart chart, without increased sampling. Alternatively, the procedure can be used to reduce the sampling without reducing the statistical efficiency. The properties (probability of a signal, average run length, average sample size, etc.) of the double sampling chart are studied, and it is compared with variable sampling interval Shewhart charts, EWMA charts, and CUSUM charts. The double sampling chart depends on five parameters, and therefore, there is a great deal of flexibility in designing the chart. Tables are provided to aid in the choice of these parameters.

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  • Topics: Sampling, Statistical Process Control (SPC)
  • Keywords: ARL contour plots,Cumulative sum control chart (CUSUM),Exponentially weighted moving average control charts (EWMA),Double sampling,Statistical process control (SPC),Variable control charts,Shewhart control chart
  • Author: Daudin, J.J.
  • Journal: Journal of Quality Technology