# what is statistical six sigma?

Six Sigma – iSixSigma Forums Old Forums General what is statistical six sigma?

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• #42517

Aman
Participant

can anybody please define six sigma for me. interms of statistics? why six sigma better than 5 sigma.? statistical theory. in relation with normal distribution.

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#134264

aiman farid
Participant

Hi Aman,

Statistical Definition of Six Sigma, There are Six standard deviations lie between the mean and the specification limit leading to:
1.   Decreasing the defects (outside the specification limits) to 2 parts per billion (No Shift)
2.   Decreasing the defects (outside the specification limits) to 3.4 parts per million (With 1.5 Sigma Shift)

Thanks,

Aiman Farid

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#134267

Ken Feldman
Participant

First thing is to figure out how to post on this Forum so you don’t post the same thing THREE times.  Second, look to the left in the blue column and find the link called “New to Six Sigma?”  Boy, there must be a full moon out again.

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#134276

Aman
Participant

Good to receive your email, thankful to ya but my question is why process is shifting only 1.5, why process is not considered shifting more or less than 1.5,

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#134277

Ken Feldman
Participant

I would suggest that you search the Archives of this Forum.  The topic has been discussed numerous times.  Bottom line is that the 1.5 shift is empirically derived and is essentially a “fudge factor”.  If you read Dr. Mikel Harry’s book he will show you how he derived the 1.46 shift….rounded to 1.5.

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