FAQ/gamma - CBU statistics Wiki

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Most distributions such as the exponential and log-Normal distributions are positive skewed with the model of the distribution for lower values.

[http://www.uib.no/people/ngbnk/kurs/notes/node31.html The Gamma distribution] which has two parameters, $$\alpha$$ and $$\beta$$ may produce negative skew where the model occurs for higher values (values > 0) when $$/alpha$$ is a lot greater than $$\beta$$. It also has no maximum value.