iSixSigma

six sigma

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #52122

    kate
    Participant

    Please tell me why standard deviation calculates in six sigma only and why not seven, eight,nine…….sigma. Why only up to six.

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    #182866

    IknowU
    Participant

    Six Sigma is itself 99.99967%……its just a target…..u can target 7,8sigma if u wish…Mumbai Dabbawalas were around 8 sigma…..
    Reg..

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    #182867

    kate
    Participant

    Thanks for the reply. Please tell if mumbai dabbawala is having around 8 sigma then what is their percentage defect.

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    #182869

    Mikel
    Member

    What a crock – that’s just an urban legend.There is no one keeping data on this antiquated tradition.

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    #182872

    lexis
    Participant

    actually you willfind the answer here, how
    accurate am not sure. But apparently is 1 in
    every 6Million.http://www.mydabbawala.com/general/about
    dabbawala.htm

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    #182873

    Natanyahoo
    Participant

    Are you kidding?8 sigma?

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    #182874

    Natanyahoo
    Participant

    No I can’t believe its 8 sigma,may be wrong calculation1

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    #183006

    GB
    Participant

    The Dabawali unions are known for inflating sigma.
    Now if you check out the Greater Mumbai Chamber of Commerce website, look for the “Original Dabawali Secessionist Liberation Group” link.   Their studies indicate a an actual Sigma range of 3.25 to 4.5 Sigma, based on the continental shift to mitigate calculation errors.
    Their brave stance has made them a target of hate and terror amongst their Daba-bretheren, yet they endure with their mission of “Truth in food delivery”.  Depak Sritharingan was the first martyr of their cause.
    RIP -Depak
     

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    #183008

    Mikel
    Member

    Find me the person who actually keeps data and I’ll try to believe the
    claims.Go looks at all the documentation on this archaic practice and then
    tell me someone actually has data. It’s all NVA and therefore all
    defects.

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    #183010

    MBBinWI
    Participant

    Mangesh:  Since I believe that your original post was in good faith, I’ll try to provide you some useful help (instead of the sarcasm from some of my co-horts on the board who seem to just be too bored and like adding interesting, sometimes even funny, replies – but no help).
    Most references only go up to 6 sigma as a convenience, and since that (unadjusted) probability under the curve for a one-sided distribution is already 0.00000000099, for most circumstances, that was deemed to be “good enough.”
    If you want to create your own table, it is easy to do in MS Excel.  Create a column of Z (number of standard deviations away from the mean), and in the next column use the function [=NORMSDIST(Z)] where Z is the cell reference where you have the Z’s.  This is for the probability under the normal curve to the left of the specified Z value (if Z is negative it is left of the mean, if positive, it is to the right of the mean).
    Calculate away on whatever level of sigma (Z) you’d like.  Hope this provided some useful assistance.

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