Grouping SPC Data

Use the Group SPC Data dialog to set the control limit calculation grouping for most control chart types.

Grouping data from the original retrieval into multiple smaller groups lets you drill down into data to search for variability and display of process improvements. Data groups calculate control limits or generate new charts for each group of data. A set of control limits and other pertinent statistics will be calculated for each data group in a retrieval.

 

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Opening the Group SPC Data dialog

There are three ways to open the Group SPC Data dialog:

Using the Settings tab to group data

To open the Group SPC Data dialog using the Settings tab:

  1. Click the Settings tab on the SPC Charts dialog

  2. Expand the Retrieval/Configuration tree. See Navigating Tree Structures for help.

  3. Double-click Group data on control and CuSum charts = .

The Group SPC Data dialog opens.

Using the chart right-click Group Data... option

  1. Right-click an open chart, and then select Group Data... :

The Group SPC Data dialog opens.

Data grouping options:

None

Anchor point

Manual Selection

Note: The Manual selection option is only available when the Group SPC Data dialog is opened using the right-click menu Group Data... option for an existing chart.

  1. Click the Manual selection option button to display the Define groups field. Initially, the Define groups area displays only the first and last data subgroups on the chart, as in this example.

  1. To divide the chart into data groups, determine which subgroup should mark the end of the first data group. Enter that number in the End point text field. For example, if you want the first data group to contain the first 25 subgroups of data, enter 25.

GainSeeker automatically defines a second data group for the remainder of the data as in the following example. Additional Start point to End point text fields can be added by repeating step 2.

Traceability change

Date/time change