The Purpose of Gamma Distribution

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I have to understand why someone would the Gamma Distribution, what does it tell it me when i use it or why would i use it in the first place?
 
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The gamma distribution appears as a result of all kinds of math - and in nature.
It is handy for statistical modelling - you'll see as you get more familiar with it.
 
The Gamma distribution has been used to model the distribution of times between earthquakes, though the Weibull distribution is a more popular choice for earthquake inter-event time applications.
 

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