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A new procedure for monitoring the range and standard deviation of a quality characteristic

Author

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  • M. Kiani
  • J. Panaretos
  • S. Psarakis

Abstract

The Shewhart and the Bonferroni-adjustment R and S chart are usually applied to monitor the range and the standard deviation of a quality characteristic. These charts are used to recognize the process variability of a quality characteristic. The control limits of these charts are constructed on the assumption that the population follows approximately the normal distribution with the standard deviation parameter known or unknown. In this article, we establish two new charts based approximately on the normal distribution. The constant values needed to construct the new control limits are dependent on the sample group size (k) and the sample subgroup size (n). Additionally, the unknown standard deviation for the proposed approaches is estimated by a uniformly minimum variance unbiased estimator (UMVUE). This estimator has variance less than that of the estimator used in the Shewhart and Bonferroni approach. The proposed approaches in the case of the unknown standard deviation, give out-of-control average run length slightly less than the Shewhart approach and considerably less than the Bonferroni-adjustment approach.
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Suggested Citation

  • M. Kiani & J. Panaretos & S. Psarakis, 2010. "A new procedure for monitoring the range and standard deviation of a quality characteristic," Quality & Quantity: International Journal of Methodology, Springer, vol. 44(1), pages 1-24, January.
    • Handle: RePEc:spr:qualqt:v:44:y:2010:i:1:p:1-24
    DOI: 10.1007/s11135-008-9175-x
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    Cited by:

    1. Lim, S.L. & Khoo, Michael B.C. & Teoh, W.L. & Xie, M., 2015. "Optimal designs of the variable sample size and sampling interval X¯ chart when process parameters are estimated," International Journal of Production Economics, Elsevier, vol. 166(C), pages 20-35.

    More about this item

    Keywords

    Shewhart; Bonferroni-adjustment; Average run length; R chart; S chart;
    All these keywords.

    JEL classification:

    • C1 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General

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