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Poisson Moving Average Versus c Chart for Nonconformities

Summary: [This abstract is based on the author's abstract.] The c chart can be a useful monitoring tool when the number of nonconformities in the inspected product is relatively small, but it is insensitive to small shifts. A more efficient approach based on the design of a Poisson moving average control chart for the number of nonconformities is proposed. The proposed chart provides fast detection of out-of-control conditions while maintaining a longer in-control average run length than the traditional c chart. The new approach is applied to two real situations.

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  • Topics:
  • Keywords: Average run length (ARL),C chart (count chart),Design of control charts,Poisson distribution,Nonconformities,Out-of-control process,In-control process
  • Author: Khoo, Michael B.C.
  • Journal: Quality Engineering