About Calibration/Optimization in Vensim

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Nasim
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Posts: 4
Joined: Thu Nov 15, 2012 11:43 pm
Vensim version: PLE+

About Calibration/Optimization in Vensim

Post by Nasim »

I am running calibrations in Vensim by changing four different parameters. I wonder whether the solutions that Vensim finds are not local minima, but actually the global minima? Also whether I run many different iterations, and choose different starting points, this will prevent from falling into a local minima or not? What other suggestions do you have?
As a not, I do change the weights for each iteration of calibration, and set it as the 1/standard deviation of the error (i.e. difference between simulated and data values) from the previous iteration, so that the maximum likelihood solution is guaranteed.

Thanks
Nasim
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