How to calculate different UCL/LCL value for sets on SPC charts node in TIBCO Statistica?
Article ID: KB0074268
Updated On:
| Products | Versions |
|---|---|
| Spotfire Statistica | 13.3.0 and higher |
Description
In the SPC Charts with alarming node, when Upper Control Limit, Lower Control Limit and Center line are configured to be calculated based on the data, identifying a set variable can force the calculation to be based on the sets rather than the whole data. As such, there will be separate control limits and center line on each set with set label enabled in the control charts. This feature is available in Version 13.3.0 and onward.
Environment
Windows
Resolution
To force the calculation of control limits and center line to be based on sets in SPC Charts with Alarming node:
1. Under X Chart Center/Sigma tab, select "Calculated process mean" as Centerline type.
2. Under X Chart Control Limits tab, select "Calculate UCL and LCL" as the Control Limits.
3. Under Vertical Delimiter tab, select "Identify sets of samples" as Vertical delimiting information type and Click "Select" to choose Variable to use as set identifier.
An example of the final control chart is shown at below:
Issue/Introduction
Calculate different UCL/LCL value for sets on SPC charts node
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