Sigma Shift

Some articles on sigma shift, sigma, sigmas:

List Of Six Sigma Software Packages - Criticism - Criticism of The 1.5 Sigma Shift
... Wheeler has dismissed the 1.5 sigma shift as "goofy" because of its arbitrary nature ... The 1.5 sigma shift has also become contentious because it results in stated "sigma levels" that reflect short-term rather than long-term performance ... The fact that it is rarely explained that a "6 sigma" process will have long-term defect rates corresponding to 4.5 sigma performance rather than actual 6 sigma performance has led several ...
List Of Six Sigma Software Packages - Origin and Meaning of The Term "six Sigma Process" - Role of The 1.5 Sigma Shift
... As a result, the number of sigmas that will fit between the process mean and the nearest specification limit may well drop over time, compared to an initial short-term study ... in process variation over time, an empirically-based 1.5 sigma shift is introduced into the calculation ... According to this idea, a process that fits 6 sigma between the process mean and the nearest specification limit in a short-term study will in the long term fit only 4.5 ...

Famous quotes containing the word shift:

    The term preschooler signals another change in our expectations of children. While toddler refers to physical development, preschooler refers to a social and intellectual activity: going to school. That shift in emphasis is tremendously important, for it is at this age that we think of children as social creatures who can begin to solve problems.
    Lawrence Kutner (20th century)