Cpk, Ppk and tolerance interval statistics are calculated from samples. The samples may not come from a process in statistical control. Therefore the calculated statistics may not be reliable. Statistical control should first be assessed by process behavior charts.
Jose,
Cpk, Ppk and tolerance interval statistics are calculated from samples. The samples may not come from a process in statistical control. Therefore the calculated statistics may not be reliable. Statistical control should first be assessed by process behavior charts.
Best,
Stan Alekman