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X-Bar Control Limits

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  • #45621

    Talaid
    Participant

    if a process fails Test 5 and Test 6, if I want to Omit the Subgroups to re-calculate the Control Limits, then do I have to Delete/Omit all the contributing subgroups in Test 5 (the 3 Subgroups data points) and Test 6 (the 4 Subgroups Data Points)?? or the ONLY one of these data points(subgroups numbers), so if Test 5 fails at data points/subgroup numbers 4 and 14, then I have delete ONLY these points or the data points before it as well..???

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    #149496

    Theo
    Member

    Many software packages make it easy to use too many detection rules, which produce excessive false alarms.  Stick to the basic rule 1.
    There is no need to recalculate limits, unless you have made a major change to the system.  Control limits are not absolutes – their aim is to gain insight into the process.

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