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.

   
   

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



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