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SAP QM - 3 sigma limits in Control Charts

Dear QM gurus,

In the control charts which we get thru QGC1/2/3, can we set a 3 sigma limits ?

My customer wants the chart to be setup so that they can plot with 3 limits +/- with target line.

At the moment I can see in the chart is that limits can be changed only as below

upper action limit

upper warning limit

target

Lower warning limit

Lower action limit

Im looking for 1 more limit up and down, is this possible ?

Thanks

Mudassar

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  • Best Answer
    Posted on Oct 08, 2015 at 03:24 PM

    Ok.. I'm not a statistical guru but I think you mixed terms. Maybe Martin can weight in on this one.

    When you want 3 sigma limits it means that you want multiple limit calulated as a wider range, say as opposed to 2 sigma or 1 sigma and is related to the number of standard deviations.

    When you specify warning limits and action limts you are specifying values at which you want something done. You have two now.. and you are asking that you add a third? How many warnings do your operators need? 😉

    Craig

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    • To be a bit more precise: the "whole number parameters" seem to be two more constants in the customizing that are used by some of the control charts only.

      As an example you can check the "moving average chart" (control chart type 520 (QRKT_MOVING_AVERAGE_2)). There one of the parameters is used for the moving range (number of samples).

      Regards

      MH

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