Ventana software support forum

Hello,

I use Vensim PLE.
Can I define a variable as a stochastic by using probability distribution functions.
Please note that I cannot use MACROs in Vensim PLE.

kind regards
Lukas

Vensim PLE supports RANDOM UNIFORM and RANDOM NORMAL - see Chapter 4 of the Reference Manual for a description of these.

Often you can transform a uniform random variable to some other desired distribution, using the cumulative distribution - either an analytic expression or a lookup table.

Also, in continuous-time models you'll want noise that has some frequency cutoff. See http://models.metasd.com/2010/03/pink-noise/

Tom

Thank you all for your replies.
Also thanks for the URL, very useful.

kind regards,
Lukas