NEW!   Managing your gages is easy with the new GAGEpack 11.
Contact us
Free monthly quality tips!

FREE Newsletter on training tips, statistical help, book reviews and new product informationSubscribe to our free monthly newsletter, Quality eLine. It offers quality improvement information, quality training tips, statistical process control help, gage R&R information, and more.
Have questions? Click to chat with one of our service and support staff.
u-chart formula

The u-chart formula (for number of nonconformities from subgroups that can vary in size):

u control chart upper & lower control limit formulas