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![The Johnson SU distribution](https://blogs.sas.com/content/iml/files/2020/01/JohnsonSU1-640x336.png)
The Johnson system (Johnson, 1949) contains a family of four distributions: the normal distribution, the lognormal distribution, the SB distribution (which models bounded distributions), and the SU distribution (which models unbounded distributions). Note that 'B' stands for 'bounded' and 'U' stands for 'unbounded.' A previous article explains the purpose of