Specify whether to use unbiasing constants when you estimate short-term and long-term standard deviations.
Unbiasing constants vary with sample size and are equal to the ratio of the expected value of the standard deviation estimate for samples of a given sample size to the standard deviation of the population. The default is to use unbiasing constants when you estimate short-term standard deviation, but not when you estimate long-term standard deviation.
For more information, go to Calculations for process statistics and capability values for Process Report.
Use the Box-Cox power transformation when your data are very skewed or when the within-subgroup variations are unstable. The transformation takes the original data to the power λ, unless λ = 0, in which case it takes the natural log.