Ventana software support forum

Hi I have a very simple problem with a model I built just as an exercise. I want to have a number of persons (customers) that have a bank account. I'm able to specify the initial values for the bank account in the Input data. However, although I specified the inflows (deposits) for the different cus...

Thanks, that helps!

Hi

I tried to introduce a new entity (gender) with properties (male, female). The model is running (somehow), but I didn't manage to sum male+female. It seems that I do something wrong with the references. The model is uploaded.

Best

Hi I wanted to modify the model "CohortPop2" as to include gender (male, female), without changing the model structure otherwise. However, I didn't manage. Is it correct to define another entity called "gender" and to use it later as an attribute for the cohorts (or for populatio...

Thanks, everything is clear. Invert selection works.

Thanks, that makes it clear. I would not include a popup-menu, but describe the issue in the help menu. I just had a look at the help menu (search term "load") and found that it is described well there. I just didn't find it before.

Hi

When I unload results, how can I reload them? I looked for the results in the "results" folder, but didn't find any.

Hi When I run a model with multiple cohorts, and want to display the results with a line chart, I get the following situation: - no problem when clicking "cohortid": all the cohorts are displayed - when unclicking "cohortid" and clicking a number of selected cohorts, I get an emp...

Hi Thanks for your reply. I can pretty well understand your point! I assume that the third option you mention is closest to my expectations. The incidence of cardiac symptoms should increase as a function of time elapsed since the last therapeutic intervention. Do you have already a sample model dem...

Hi I'm still working on the cohort modeling issue. I would be interested to have a stock with two outflows. One is related to deaths (mortality rate as a function of age), and the other as a function of the duration in that stock (incidence rate of cardiac symptoms). The first flow rate is straightf...

I wanted to copy paste part of a model to a new diagram. Both paste as well as paste new create an error message.

A simple question: I wanted to create a subcollection of population in the CohortPop2 model for the sexual active population. I tried to create an attribute (sexual active), depending on Age (15< Age < 70). But this obviously didn't work and I was also not able to use this information to build the s...

A good example might be AIDS, where infections start with a certain age, and decline after a certain age (sexual behavior). This could be described by a contact rate depending on age. What do you think about that? Yet, the population of the first "infected" is not clear to me.

Regards

Hi Tom This is great! The models and your explanation helped me a lot to get the concept. Just as a test for myself I added in CohortPop1 and CohortPop2 the issue of the onset of a chronic disease (say diabetes, starting at a certain age). This is straightforward indeed (see attachment). In CohortPo...

Hi

A problem occurs when I want to delete a text.

Hi Tom, thanks for your reply Yes, it would be great to have an example of a population model with a number of age classes, to understand how Ventity works in this regard. Do I understand correctly, that a cohort (say: born between 1961 and 1980) keeps this information as an attribute throughout the...

Thanks. My problem was to delete an arrow between variables. But obviously this was "old" Vensim thinking... I realized that I have to delete the variable which is the cause from the diagram.

Justus

How do I delete an arrow, or a note? selecting the item and right-clicking doesn't work, nor using the menubar (cut, delete).

Thanks
Justus

Along the same lines I would wish to have a number of small models or building blocks, that demonstrate how Ventity works. For example: - aging chain with a small number of stages; cohort model (not in combination with the car fleet model; only the aging mechanism as such) - aging chain with leakage...