How Do I Create U-Charts in Excel Using SigmaXL?
U-Charts
- Open Attribute Data U Chart Defects.xlsx. U Charts (for Defects) can have fixed or varying subgroup sizes.
- Select SigmaXL > Control Charts > Attribute Charts> U. Ensure that the entire data table is selected. If not, check Use Entire Data Table. Click Next.
- Select Defects, click Numeric Data Variable (Y) >>.
Select N, click Subgroup Column or Size >>. Check
Tests for Special Causes.
- Click OK. The resulting U-Chart is shown:

This is a stable process, with no tests for special causes flagged.
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