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
To delete a point from a control chart:
- Click on the chart.
- 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.
- 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:
- Re-run stability analysis without the deleted point by selecting "Analyze Stability" on the same menu.
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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