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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CP CPK

Dewey Dorsett

Dewey is an Executive Consultant at OT Consulting Group and has consulted and delivered outstanding results to clients in manufacturing and service industries for 16 years using Lean, and Six Sigma Supply Chain deployments in both domestic and international environments. Prior to consulting, he worked in manufacturing industries in quality, productivity and sales capacities.