Select the method or formula of your choice.
In This Topic
Plotted points
The plotted points represent the number of defects in each subgroup, 
.
Center line
The center line represents the process mean, 
. If you do not specify a historical value, then Minitab uses the mean from your data, 
, to estimate 
.
Notation
| Term | Description |
|---|---|
 | number of defects in subgroup  |
 | number of subgroups |
Control limits
Lower control limit (LCL)
The LCL is the greater of the following:
Upper control limit (UCL)
Notation
| Term | Description |
|---|---|
 | process mean |
 | parameter for Test 1. The default is 3. (For more information go to Select tests for special causes for C Chart.) |
