ET stands for Engineering Tolerance, which is the width between the specification limits. The equation for Cp is often written ET / NT. ![]() A single letter that, by the way, doesn’t really explain anything about how these two statistics are different. Their names are different by only a single letter. Two capability statistics that are hard to keep straight are Cp and Cpk. ![]() But there are so many capability statistics that it's worth taking some time to understand how they’re useful together. These statistics tell you how well your process is meeting the specifications that you have. Capability statistics are wonderful things.
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