LCL in a U Chart
LCL in a U Chart
(OP)
Greetings everybody,
I am putting together a U-Control Chart (Nonconformities per unit)and seem to be getting a negative LCL. I've checked my formula and seems correct. What does the negative LCL mean? Thank you in advance for your responses. It will help me a great deal.
I am putting together a U-Control Chart (Nonconformities per unit)and seem to be getting a negative LCL. I've checked my formula and seems correct. What does the negative LCL mean? Thank you in advance for your responses. It will help me a great deal.





RE: LCL in a U Chart
RE: LCL in a U Chart
http://www.sytsma.com/tqmtools/uchart.html
Here's another that says assume a LCL of 0 whenever the data cannot possibly be lower than 0.
http://www.hanford.gov/safety/vpp/spc.htm
clear as mud?
RE: LCL in a U Chart