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Key Points Trend charts are used to see the changes throughout a process. They come in different forms like the run, control, and time series charts. Trend charts are used to monitor your process ...
Acheson J. Duncan, The Economic Design of |barX Charts used to Maintain Current Control of a Process, Journal of the American Statistical Association, Vol. 51, No. 274 (Jun., 1956), pp. 228-242 ...