The SHEWHART Procedure
The Index CPU
The process capability index CPU is computed as
![\[ CPU = (USL- \overline{\overline{X}})/3\hat{\sigma } \]](images/qcug_shewhart0281.png)
If you do not specify USL, the variable _CPU_ is assigned a missing value.
The process capability index CPU is computed as
If you do not specify USL, the variable _CPU_ is assigned a missing value.