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SPC graph on one side of the mean.

Six Sigma – iSixSigma Forums Old Forums General SPC graph on one side of the mean.

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  • #42239

    Nikhil
    Participant

    How advisable it is to shift the mean in a Xbar-R control chart, if  i am getting  Xbar  chart  consistently on one side of the mean.
     
    thanks,
    Nik

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    #133325

    Mr IAM
    Participant

    If your getting points below the mean – that would mean the process in not in statistical control.  So, some root cause analysis is in order (even if lower is better).
    A recent post provided the real reasons to adjust UCL / LCL and X-Bar
    https://www.isixsigma.com/forum/showmessage.asp?messageID=87297

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