Frechet & MonteCarlo

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lorenzo.cioni
Senior Member
Posts: 97
Joined: Wed Jul 30, 2014 7:09 am
Vensim version: PLE

Frechet & MonteCarlo

Post by lorenzo.cioni » Sat May 25, 2019 4:16 pm

Hi all
I would like to use a parameter modelled with a Frechet distribution in a MonteCarlo simulation of a Vensim Plus model. In SntheSym I can use the trick of implementing the Frechet distribution as betaScale*(-LOG(X , 10 ))^(-1/alphaShape) but how can I proceed in the Sensitivity Simulation Setup dialog box?Man thanks in advance.
All the best.
Lorenzo

tomfid
Administrator
Posts: 2590
Joined: Wed May 24, 2006 4:54 am

Re: Frechet & MonteCarlo

Post by tomfid » Sun May 26, 2019 3:51 pm

Use the sensitivity control to generate a uniform random variable and transform that in another model variable, just as you would for a regular simulation.

lorenzo.cioni
Senior Member
Posts: 97
Joined: Wed Jul 30, 2014 7:09 am
Vensim version: PLE

Re: Frechet & MonteCarlo

Post by lorenzo.cioni » Mon May 27, 2019 9:11 pm

Hi tomfid
thank you.. very simple, indeed, like Columbus' egg...
very precise and accurate as usual.
all the best.
Lorenzo

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