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I am learning to apply Control Charts to understand process signals. Of late, I tried to use Control chart for some of our attribute data but find it very insensitive to identify signals that require attention. I am attaching a sample here with hypothetical data though. I have constructed both Xmr chart and C Chart. XmR apparently does a better job. This is not the only instance. I tried it on 3 other data and all of them have ended up with wide limits. Please help me. Is there anything I can change in my approach or perspective?
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