Here are some examples of control limit formulas: There are seven main types of control charts (c, p, u, np, individual moving range XmR, XbarR and XbarS.) Plus there are many more variations for special circumstances. The formula for sigma depends on the type of data you have:Įach type of data has its own distinct formula for sigma and, therefore, its own type of control chart. Why are there so many formulas for sigma? ± 2 sigma and ± 3 sigma from the center line. The formula for sigma varies depending on the type of data you have. The Center Line equals either the average or median of your data. Free Agile Lean Six Sigma Trainer TrainingĦ8.3% of the data points should fall between ± 1 sigma.ĩ5.5% of the data points should fall between ± 2 sigma.ĩ9.7% of the data points should fall between the UCL and LCL.Animated Lean Six Sigma Video Tutorials.
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