Enter historical parameters for EWMA Chart

Stat > Control Charts > Time-Weighted Charts > EWMA > EWMA Options > Parameters

Enter the historical values for the parameters that Minitab uses to calculate the center line and control limits. If you do not enter values, Minitab estimates the mean and the standard deviation from the data. If you enter only one value, Minitab estimates the other parameter from the data.

Mean
You can enter a single mean for the entire chart, or you can enter a mean for each stage. Minitab uses the mean to calculate the center line and control limits.
Standard deviation
You can enter a single standard deviation for the entire chart, or you can enter a standard deviation for each stage. Minitab uses the standard deviation to calculate the control limits.
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