Skewed Distribution 참고

Pearson Type III Distribution
http://mathworld.wolfram.com/PearsonTypeIIIDistribution.html
https://cran.r-project.org/web/packages/PearsonDS/PearsonDS.pdf

Sample Variance Distribution
http://mathworld.wolfram.com/SampleVarianceDistribution.html

7.8 The Distribution of the Standard Deviation.
https://www.researchgate.net/post/Standard_Deviation_Distribution
http://krishikosh.egranth.ac.in/bitstream/1/2025521/1/G2257.pdf
http://mathworld.wolfram.com/StandardDeviationDistribution.html

Skewed Distribution and Control Chart
file:///home/choby/Downloads/Maragkos_2015.pdf