Process Capability: Why you should use the K-Score method and not the Percentile method

Capability indices are defined based on the properties of a Normal distribution. To generalise their definition to non-normal data, there are two methods, the ISO Percentiles method and the K-Score method. If you are working with process capability indices you really need to understand the difference. In this video I discuss both methods, and explain why I think you should consider using the K-Score method even though JMP Software defaults to the Percentile method.