You may need to update individual data observations to fix data entry errors or update
assignable causes and corrective actions. Both the Station Dashboard and the Process Quality
Snapshot in Real-Time SPC provide access to the individual observations via the control
charts.
What happens when I update individual observations?
The editing of an individual observation follows the same workflow as
entering a new observation, and the calculations and flagged points are updated
with the new data. When you update an individual observation, the following
items are also updated.
The plotted points of a control chart are updated, including the updated
point and any associated subgroups.
The tests for special causes of a control chart are rerun.
The summary and performance statistics are updated.
If the original data point was flagged and had assignable causes and/or corrective actions,
these will remain if the point still exceeds the limits. If the point no longer exceeds
the limits, the flag, assignable cause, and correctives are removed.
Note
Control chart points with assignable causes are not used in the
control limit calculations.
How to edit individual observations
In this example, the
supervisor reviews the
Process Quality
Snapshot
and notices that a pH measurement was recorded incorrectly.
Open the control chart that contains the observation that you want to
edit.
You can access the control charts from the
Station Dashboard
or the
Process Quality
Snapshot.
Select the plotted point to edit, then open the details pane.
Under
Individual Observations,
select
Edit
to open a dialog to edit the data observation or descriptor value. You can also
update the assignable causes and corrective actions and add any additional
comments.
If you want to edit only the assignable causes, corrective actions, or
comments for the entire plotted point, select
Edit
in the flagged point box.
Edit descriptors
Subgroup descriptors
You can edit the data for the subgroup descriptors. These values apply
to every observation in the subgroup.
Individual descriptors
Under
Individual Observations,
select
Edit
to open a dialog to edit the data observation or descriptor value.
