Ventana software support forum

Thank you for the advice Tom.

I have left another note on the other thread for your follow up.

Will read up the paper in the meantime, to find out what's wrong.

Thank you!

Thank you for the advice Tom. I have done the following and have a few follow up questions. 1) Static vs Dynamic models Because the Vensim PLE does not have a calibration feature, I used a statistical software to churn out the coefficients to input into Vensim. The problem is the statistical softwar...

Sounds great! Thank you for the advice Tom!

Do you know if Vensim allow momentum (ie lagged variables that are endogenous in nature) in system dynamics (SD)?

Thank you once again!

Hi all

Anyone knows if Vensim can simulate the effects of an Error Correction Model (ECM) - an Econometrics model?

Thank you for the model, Tom. The only issue I have is the data inputs are not as readily available.

This is my whole model, and you will see what I mean. I wanted to understand if I simulated the endogenous variables correctly.

Could you kindly advise?

To the administrator: That is right! lnavailstk is an endogenous variable (therefore the loop from "rate of flow"), and lnrgdp is an exogenous variable. "Rate of flow" here refers to the available stock that is carried into the next period. Therefore, the regression equation that...

Hi there! Thank you so so much for all the help! The program now runs with the lookup command!! I have encountered another issue - which is to simulate an endogenous variable into the model. Here, the "rate of flow' variable IS the "lnrgdp" variable because it is an endogenous variabl...

Hi there! This is another file, but with data uploaded via LOOKUP method. Basically, I am trying to simulate the regression with 4 variables, whereby "fraction" represents the coefficients of variables, and the variables are all lagged in nature, hence the "DELAY FIXED" command. ...

Hi there!

Thank you so much for your prompt reply.

Attached is my model with the data input via a .dat file.

HI! Thank you for the response. I actually managed to figure that out earlier and am able to upload the data now into Vensim PLE. However, I realized that when I simulate the program, I received the two error messages; ERROR: The variable- dlnrgdp -and perhaps others require a data file be specified...

Hi there! I am having some trouble uploading data onto Vensim PLE. My variables are in the type "data" because I am trying to run a time-series excel sheet. I have tried to convert the xlsx (excel) file to a .txt file, and then saving it as a .dat file. The first row is the Time variable, ...