# How to calculate CPK with n = 1

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Hi all. I was wondering how to calculate Cpk using Rbar/d2 with a subgroup size of n = 1. All of the d2 charts I have list a minimum d2 value set at n = 2. Should we use the Ppk standard deviation or some other value for d2?

Thanks,

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Thanks Bev! It sure is great having this forum back again! I hope you have a swell Christmas too. Maybe some day our paths will cross again.

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