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A note on maximum Z-scores for control charts for individuals |
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| Authors: | William H Wooda |
| Institution: | Department of Management Science and Statistics , University of Alabama , Tuscaloosa, AL 35487-0226 |
| Abstract: | Control chart limits are often constructed retrospectively based on a sequence of individual measurements. It is shown that the usual control chart limits cannot be crossed for small numbers of measurements. |
| Keywords: | statistical process control X-chart moving range |