Terry Krueger

Tim,
I agree with you – especially on the 1.5 Sigma shift concept. If you look at the definition of Six Sigma as standard deviations from the spec limit, then there should not be a negative sigma, but it should be noted that the standard deviations are on the wrong side of the spec limit. Mathematically this is represented by a negative -…[Read more]

Two things
Squaring a number eliminates negatives
Squaring also produces a nonlinear curve (like chi-square)
e.g.
2>4
4>16
16>256
and therefore visibility increases exponentially.