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How Do I Create U-Charts in Excel Using SigmaXL?

U-Charts

  1. Open Attribute Data U Chart Defects.xlsx.  U Charts (for Defects) can have fixed or varying subgroup sizes.
  2. Select SigmaXL > Control Charts > Attribute Charts> U. Ensure that the entire data table is selected. If not, check Use Entire Data Table. Click Next.
  3. Select Defects, click Numeric Data Variable (Y) >>. Select N, click Subgroup Column or Size >>.  Check Tests for Special Causes.


    SigmaXL u-Chart Options


  4. Click OK. The resulting U-Chart is shown:

  5. nP-Chart in Excel

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

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