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To create a u chart for the average number of flaws per shirt in each box, you can specify SHIRTS as a HISTORY= data set. title 'Total Flaws per Box of Shirts'; symbol v=dot c=vig; proc shewhart ...
title 'u Chart for Fabric Defects per Square Meter'; symbol v=dot c=vig; proc shewhart data=fabrics2; uchart defects*roll / subgroupn = sqmeters outlimits = flimits cframe = steel cinfill = ligr ...