A Distribution-Free Phase I Control Chart for Subgroup Scale

Article

Jones-Farmer, L. Allison; Champ, Charles W.   (ASQ)   Auburn University, Auburn, AL; Georgia Southern University, Statesboro, GA

Journal of Quality Technology    Vol. 42    No. 4
QICID: 32651    October 2010    pp. 373-387
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Article Abstract

[This abstract is based on the authors' abstract.] A Phase I control chart that is distribution free is proposed for processes that are in control. The proposed method achieves in-control performance when used with both normal and nonnormal data and is sensitive to subgroup differences in process scale. Guidance is provided for combining this method with an existing distribution-free Phase I chart for studying process location.

Keywords

Nonparametric methods; Shewhart control chart; Statistical process control (SPC); Distribution-free procedures; Process control


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