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Delete a Point from a Control Chart

Remove Points from a Control Chart and Control Limit Calculations

It's easy to delete a point from a control chart created using QI Macros. The process is different depending on how you create your control chart:

• Control Charts Created with a Macro
• Control Charts Created Using Control Chart Templates
• Excel 2007 Workaround for Deleting a Point on an Embedded Chart

Control Charts Created with a Macro

To delete a point from a control chart:

1. Click on the chart.
2. Next, select the point you want to delete:
   
   

    

   Tip: The first time you click on a point, Excel will select the whole line. Click on the point a second time to select just the point. If you have done this correctly, Excel will highlight your point.

3. Click on the "QI Macros Chart" menu (to the far right) to open the control chart tools menu. Select "Delete Point" from the "Show Process Changes" drop-down:
   
   

   

4. Re-run stability analysis without the deleted point by selecting "Analyze Stability" on the same menu.

Control Chart Created with a Template

For QI Macros version 10.2021: Delete a point on a control chart template by using the instructions listed above.

And once the point has been deleted, make sure to re-run stability analysis by selecting "Analyze Stability" from the "QIMacros Chart" menu.

NOTE: If you are using a version of QI Macros that is from 07.2021 or older, do not use the "Delete Point" function from the QI Macros Chart section - the function will remove necessary calculations from your template.

Simply remove that point from the template's input area - this will automatically remove the point from your data set.

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