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Lean Six Sigma Q&A - GoLeanSixSigma.com

How it is possible to calculate CP or CPK if I have non-normal data?

The non-normal calculation is based on the maximum likihood estimate of the distribution parameters rather than the mean and variance associated with the normal distribution. These parameters estimate the distribution proportions for the capability calculation. For example, a Gamma distribution is defined by shape, scale and theshold parameters. A Poisson distribution is defined by Lambda,…
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