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Moulding has several quality measurements so  data must be analysed multivariately.

Is there a multivariate equivalent of the process capability index  Cpk?  How can I estimate its confidence interval (CI)?

Then can I use the formulation to estimate the sample size needed for a specified CI?

I want to apply this to multi-cavity moulds.

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Take a look at Foster etal, International Journal of Production Research, vol 43, No. 10, 15 May 2005, 2135-2148.

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