The process performance index (Ppk) measures the performance of a process relative to the specification limits, accounting for the mean and variability of the process. It is an indicator of how well the process can produce output within the specification limits.
References:
Montgomery, D.C. (2009). Introduction to Statistical Quality Control. Wiley.
ASQ. (n.d.). Process Performance (Pp, Ppk). Retrieved from https://asq.org/quality-resources/process-performance
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Questions # 52:
Writing and establishing process control procedures is
