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Capability Ratio

The capability ratio is the inverse of the Cp index. Remember that the Cp index is the specification spread divided by the process spread of six standard deviations. Flip that formula around and you would be dividing the process spread by the specification spread. In the case of a capability ratio, you would be looking for a smaller-is-better characteristic. With the Cp index, you are looking for a larger-is-better characteristic.

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