4 ms·
For whatever reason, the "Six Sigma" techniques/ideas aren't using "Two Sigma" to refer to ±2σ, instead they're referring to the width of the band around the me
by fiter 10y ago
For whatever reason, the "Six Sigma" techniques/ideas aren't using "Two Sigma" to refer to ±2σ, instead they're referring to the width of the band around the mean.
https://en.wikipedia.org/wiki/Six_Sigma#Sigma_levels https://en.wikipedia.org/wiki/Six_Sigma#Sigma_levels
- OJFord 10y ago> For whatever reason, ... they're referring to the width of the band around the mean. That's exactly how I learnt it in secondary school, the standard deviation, what's the problem?
- huac 10y agoYeah, and it's apparently also shifted down by 1.5 sigma.
- leereeves 10y agoThat's apparently based on Motorola's data regarding process drift. > Motorola has determined, through years of process and data collection, that processes vary and drift over time – what they call the Long-Term Dynamic Mean Variation. This variation typically falls between 1.4 and 1.6. https://www.isixsigma.com/new-to-six-sigma/dmaic/15-sigma-process-shift/ https://www.isixsigma.com/new-to-six-sigma/dmaic/15-sigma-pr...