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A Variable Sampling Interval Synthetic Xbar Chart for the Process Mean
Fig 3
A graphical illustration of the VSI synthetic chart.
The VSI synthetic chart consists of the sub-chart and the CRL sub-chart. The short and long sampling intervals are used in the sub-chart and the CRL sub-chart.
doi: https://doi.org/10.1371/journal.pone.0126331.g003