On 2-D Control Charts

Abstract

To monitor a production process by charting, it usually requires that one should plot at least two charts, one for location shift and one for dispersion checking. We discuss the issues of combining two charts into one and give some recommendations. In particular, an optimal two-dimensional (2-D) chart is constructed. In addition, another 2-D chart, which is easier to implement but only slightly sub-optimal for commonly used small sizes, is also proposed.

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