Change the estimation method for process variation

To change the estimation method when you create a control chart, do the following:
  1. In the main dialog box, click the chart options button (for example, Xbar Options).
  2. Click the Estimate tab.

To change the estimation method when you conduct a capability analysis or create a Process Capability Sixpack™, click the Estimate button in the main dialog box.

Changes made in the dialog boxes of control charts, capability analysis, or Capability Sixpack affect the current project only. To change the default method of estimating the standard deviation for future projects, choose File > Options > Control Charts and Quality Tools > Estimating Standard Deviation.


If you would like to change the estimation method for completed analyses, you must rerun them with the new settings.