Capability on multiple points on one part.

Six Sigma – iSixSigma Forums Old Forums General Capability on multiple points on one part.

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    I know somewhere I have read about this, but I can not find the reference article.  I have a single part that I am checking force efforts at multiple points and they all have the same specifications.  What happens is that the points end up having different distributions and are diffent means, but equal variations.  The problem is when I check their capability they are drastically different (big surprise).  How do I “average” over the points.  Do I:
    A.  Pool my standard deviation and average my means and calculate;
    B.  Average my ppm and then back into capability;
    C.  average the indices (which I know is incorrect);
    D. Throw all the data points into one melting pot and calculate;
    Or is there some other way out there that is more correct than another?

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