These preferences are the initial settings for all control charts. To change settings by measure, go to Specify control chart settings for each measure.
The available estimation methods depend on the type of control chart and the subgroup size.
Control chart  Estimation methods 

IMR Chart 

XbarR Chart 

XbarS Chart 

IMRR/S Chart  For betweensubgroup standard deviation:

EWMA Chart  When subgroup size > 1:

Use the tests to determine which observations to investigate and to identify the specific patterns and trends in your data. By default, RealTime SPC uses only Test 1. Select additional tests based on company or industry standards.
For new control charts, the center line and control limits are calculated from the data. You can specify the moving data range for these calculations.
For continuous data, the default is 100 observations. For attribute data, the default is 25 subgroups. Change these settings if you want to include more or less data in the calculations.
After the center line and control limits of a control chart have been calculated, they are set and locked. These lines will remain until a new calculation is initiated. For more information on control limit options, go to Control limit options.