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Process Shift

Six Sigma – iSixSigma Forums Old Forums General Process Shift

  • This topic has 6 replies, 4 voices, and was last updated 15 years ago by QE.
Viewing 7 posts - 1 through 7 (of 7 total)
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  • #47716

    QE
    Participant

    I am trying to display a shift in our process by overlaying normal curves obtained from analysing samples taken at different times in the process. Would anyone have an idea of what statistical software has this capability?
    Thanks!

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    #159379

    drquality
    Participant

    Minitab will give you both the “normal curve” and the CPk for each set of results. Then I would suggest you use a more esthetic software to create the curves and overlay them with labels of the Minitab results on each (e.g. PowerPoint).
     
    Dr. Scott

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    #159381

    QE
    Participant

    Thanks for the suggestion Dr. Scott! I was using Minitab to analyze the data, but I needed something else (like ppt) to display the findings so it is easier to visualize for everyone. I was just wondering if there is anything out there that would create such a graph automatically from multiple data sets.

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    #159383

    clb1
    Participant

    Another option would be time ordered box plots. 

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    #159386

    QE
    Participant

    Box Plots are the way to go, that is true, but for some reason people find it dificult to relate to this kind of charts, so I guess I’m looking for a “pretty picture” solution here.
     

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    #159387

    GrayR
    Participant

    We use staged control charts.  Staging a control chart is easily done in Minitab. The data do not have to be continual (time-wise) to show the process shift.  Doing it with staged control chart is a very visual way to show process shift and improvement.

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    #159389

    QE
    Participant

    Your insight is greatly appreciated! Thanks Gary, I did not know you can do that in minitab and I agree, it makes it easy to see the shift.
    Thank you all! Good stuff!
     
     

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