Exclude/Return Samples in Control Chart Calculation

During runtime, when SPC is in Exclusion Mode, an operator can exclude one or more samples from calculation. An operator can also re-include samples.

As soon as you toggle the exclusion state of a sample, SPC immediately recalculates the control limits displayed on the chart.

The following symbols allow you to view exclusion status.


In the upper left-hand corner of the SPC control chart

Exclusion mode is on.


Represents a sample

Sample is included in the calculation.


Represents a sample

Sample is excluded from calculation.

 To exclude samples from a control chart when SPC is in Exclusion Mode:

Do one of the following.

Method 1

Click on a dot that represents the sample to toggle its exclusion state.

Result: The dot will change to an X indicating that the sample is excluded.

Method 2

  1. Click on a corner of the group of sample to be excluded.

  2. Drag the cursor over the entire groups of samples. Note that a box will appear around the selected samples.

  3. Release the mouse button.

Result: Each dot that represented an included sample changes to an X, indicating the sample is now excluded.

 Note: The GetControlLimits() ActiveX method provides access to the control limits displayed on the chart.

More information

Step 3.6. Set criteria for variable control tests.