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How to get time at equilibrium

Posted: Thu Apr 12, 2007 1:51 pm
by Monte
Dear Sirs,

Is there a simple and quick way to observe the time when a level reaches equilibrium. That time is very sensitive. In sensitivity testing, I had to adjust the time scale of the output graph every time, to be able to know when the level reach final equilibrium.

Is there a special function to tell me when the level just stops changing?

Thank you very much.

Monte

Posted: Fri Apr 13, 2007 10:25 am
by bob@vensim.com
Just compare your variable to a smooth of the variable for example for a strictly positive variable

fractional change magnitude = ABS(variable - SMOOTH(variable,TIME STEP))/(variable * TIME STEP)

would be a good measure.