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Sigma shift

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  • #27748

    V. Hill
    Member

    We do not have to accept a 1.5 sigma shift. If we are monitoring a process we have the opportunity to make adjustments to lessen the variation and keep the shift from happening. If may not be completly necessary but, if we determine the cost of the shift is greater than the cost to adjust we can make the necessary adjustment to the process.

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    #68316

    anon
    Participant

    What BS!!!!!
    You know how to keep shift from happening accross your enterprise? Please, please, please tell us how.

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    #68320

    Marc Richardson
    Participant

    By way of reminder, if you are adjusting a stable process, you are tampering and in so doing, increasing the overall variation of the process.
    Respectfully,
    Marc Richardson
    Sr. Q.A. Engineer

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    #68333

    Michael Wiley
    Participant

    Like the bumber sticker says “Shift Happens”.  This is accounting for uncontrollable events.   
    We all may know a little background on why the shift is included in calculating Sigma Level, for one, Motorola uses it and their semi-conductor processes are extremely complex, but its origin comes from Carl Friedr. Gaub back in 1777-1855.
    Check out the 10Deutsche Mark to see his picture and the equation he lays claim that explains the shift of stars as time passes. 
    Ofcourse its optional to include a 1.5 std dev shift, not used  for measuring short term occurences.  Though when measuring over a period of time, I understand it is more accurate to calculate sigma level by including the shift.  
    Best regards,
     

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