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. 2017 Nov 2;27(1):61–65. doi: 10.1136/bmjqs-2017-006963

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Run chart 3 shows a median fidelity above 70%, but the run chart is not stable. The run chart line crosses the median only once. For a run chart where there are 10 points that do not fall on the median, we would expect to see the median crossed at least three times⁸. Each data point represents 10 observations.