The difference between Ppk and Cpk—Why the same data results in 1.04 and 1.46

When I reported, "The process capability was Cpk 1.04," the client replied like this."That is Ppk, isn't it? Please also provide the Cpk."It is the same 50 pieces of data. When recalculated, the Cpk ...
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Example 7.2: Approximate Confidence Limits for Cpk

This example illustrates how you can use the OUTPUT statement to compute confidence limits for the capability index C pk. You can request the approximate confidence limits given by Bissell (1990) with ...
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Example 1.3: Displaying a Confidence Interval for Cpk

In this example, the capability index C pk is computed for the amplification data in AMPS. To examine the accuracy of this estimate, the following statements calculate a 90% confidence interval for C ...