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How to create a random gamma distributed vector with a mean of 0.1 and entries between 0 and 1?

Asked by Anna Igbeta on 11 Sep 2017
Latest activity Commented on by Sky Sartorius on 11 Sep 2017
I would like to create a random gamma distributed vector with a specific mean (0.1) and only values between 0 and 1. How ? Just how?

  1 Comment

The gamma distribution is unbounded, which makes it a difficult candidate for what you're trying to do without adding steps such as clipping.
Check out the beta distribution to see if that will work for you. You can use betaincinv to help generate the vector.

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1 Answer

Answer by José-Luis
on 11 Sep 2017
Edited by José-Luis
on 11 Sep 2017
 Accepted Answer

The gamma distribution takes two parameters: the shape and the scale. The mean of the distribution will be shape/scale.
That means that for a given mean (pun not intended), there are infinitely many gamma distributions. You'd need to pick either the scale or the shape and then get the other one, given your mean.
Also, the gamma distribution is asymptotic, if you limit it to the 0-1 interval then what you have is a truncated distribution that might be a very bad approximation of the gamma distribution depending on your selected shape and scale parameters.

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