Ventana software support forum

I already tried it but the sum of the calibrated utilities was not equal to 0...

I am not understanding how the norm utility[x] equation enforces the sum of utilities to be zero. Can you explain the reasoning behind it?

Thanks

I am following your suggestion and trying the normalization approach.
If I understood correctly, in the equations you presented above, you are saying to multiply the fraction[x] with the utility[x]. If I do that I am defining that, in the base run, the utility computed is 1/5 if its initial value?

G

Hi, I defined a model variable that computes the sum of the 5 constant variables: Total utilities=sum(utilities(i!) where, Utilities(i) represent the constant variables that I want to calibrate (one for each vehicle type: BEV, PHEV, HEV, Gas and Diesel) How the penalty function works? I never heard ...

Hi, I am calibrating my model through the optimization tool of Vensim. My question is related with the optimization parameters choice. I selected 5 constant variables to be calibatred which range of values is indifferent as long as the sum of these variables equals to zero. How can I define these re...

Hi,

Thanks for the suggestion! It worked! This model is not finished, I still have to work on it a little bit in order to correct some problems to add the missing unit specifications.
Anyway your help was precious so thanks one more time!

G

Hi,

For more clarity of the problem I am sending the model attached.

G

Hi, I have a variable in my model , “Range”, that changes over time according to the “Fuel efficiency” value. The equations defined for the involved variables are: Range t=1200+(1200*Fuel efficiency t)*(Time-2013) Fuel efficiency t=IF THEN ELSE (“DIF final diesel price t”>0 :OR: “DIF final gasoline ...

Hi, I have a variable in my vensim model , “Range”, that changes over time according to the “Fuel efficiency” value. The equations defined for the involved variables are: Range t=1200+(1200*Fuel efficiency t)*(Time-2013) Fuel efficiency t=IF THEN ELSE (“DIF final diesel price t”>0 :OR: “DIF final ga...