u-Chart

Attribute control chart monitoring defects per unit when sample size or opportunity varies.

Examples

01Fabric inspection tracks a u-Chart of defects per square metre, because roll sizes vary between 50 and 120 m².
02The weaving supplier sends u-Chart data for each delivery, which the buyer reviews before approving payment.
03When the u-Chart shows a point above the upper limit, the roll is held and the loom's tension settings are checked.