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I want to generate random numbers. But i want it like this. for example i want to generate random numbers for The gamma distribution coefficient of skewness 2.
How can i do this?
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José-Luis
el 6 de Dic. de 2012
Editada: José-Luis
el 6 de Dic. de 2012
doc gamrnd
The skewness is a function of one of the two parameters of the distribution, that you can set as you see fit. You just need to set it so the skewness is two (look at the wikipedia article on the gamma distribution).
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José-Luis
el 13 de Dic. de 2012
Editada: José-Luis
el 13 de Dic. de 2012
From one of your comments.
When you do this:
i write this on matlab skewness = 2; scale = 1; shape = 2./sqrt(skewness); x=gamrnd(shape,scale) s=skewness(x)
Skewness becomes a variable, and overshadows the built-in skewness function in Matlab. It is good practice not to do that, as problems as the one got might pop-up (you think you are calling a function but you are in fact trying to access a variable).
After clearing your work space to make sure there is no variable called skweness in it, do this instead:
ske = 2;
sca = 1;
shap = 1/sqrt(2);
x = gamrnd(shap,sca,[1000 1]);
your_skew = skewness(x);
Please accept an answer if it helped you.
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Jonathan Sullivan
el 6 de Dic. de 2012
skewness is simple 2 divided by the square root of the shape parameter for gamma distributions. Here's an example.
skewness = 2;
scale = 1;
shape = 2./sqrt(skewness);
gamrnd(shape,scale)
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