Ventana software support forum

Hello, By using Vensim software, we have built a model regarding healthcare waste management in environmental engineering department. We are now working on the validation of this model and seeking ideas/comments for this model as attached. Is there anyone interested in healthcare waste management an...

Many thanks..

Hello after a long time,

Is there any example on how to use DELAY information functions as a link/file or etc.

I find it confusing to decide which delay function (order of it) to use in my model...

Thanks

Hi, Could anyone please explain how DELAY1 is different than DELAY3 logically?..or how can I justify that I use DELAY3 but not DELAY1 in my model?.. I know that DELAY 3 takes it as if there are 3 stocks...I wonder how we decide delay3 is more suitable for our model? Is it because of time step should...

OK thank you..

Thank you so much for your response.. I exported the sensitivity run to the excel file and traced the values.. When I set D in a range of 0.05-0.45 rather than (0.05-0.20) I have one peak or if I use Random Normal Simulation I have one peak again.. If it is not too many questions can I ask; (1) The ...

I thought that C should be decreasing as I set a range for Y smaller than its actual value so i thought only E*D could cause an increase for B as I set a range for D bigger than its actual value.. Could you please explain me more about what I think please-I understand your comment for E but how does...

I managed to attach the bar chart as Jpeg.. It is a histogram for parameter B.. More often, you tend to get a normal type distribution where a single peak displays the most frequently occurring. This clustering around a single value of B and then a distribution of other values with smaller frequenci...

Could you pls check bar chart histogram for the final time..there are two peak columns..

Y= RANDOM UNIFORM (1, 1.8 )

Thank you, I simplified my model and attached. What I want to do is to run a sensitivity test for B by setting these ranges to my two parameters: Y=RANDOM UNIFORM (1,1.8) D= RANDOM UNIFORM (0.05-0.20) Regardless of the number of simulation I have two peaks in histogram (for the final time).. I am wo...

Thank you, Then it means, for example SALES model (in Vensim Guide) if we set a range for "price of item" (lets say 100-200 random unifrom), we can run sensitivity for cash flow.. When I do so, the histogram for the last time appears with two peak columns (bimodel).. However I know that mo...

Hi, I am using Vensim PLE plus and want to conduct sensitivity analysis for one parameter (C) by setting a range for two parameters (A and B).. However parameters A and B are not in a feedback loop with parameter C..Their relation is like below: C= X+Y*B Y=W*A Can I still use sensitivity analysis to...

Many thanks,
Nesli

Can I ask one more question,

When I click on units check, it gives another warning that: WARNING: Lookup used with dimensioned argument-Year,

I know I use lookup function dependant on time, so what is the point of this error message?
Thanks again..

Thank you so much, when i changed the time period, i missed to add the values for the years 20-33 to the Lookup..
Yes it is ok now, many thanks..
nesli

Hello, I have a question to ask.. I have Look up table in my model dependant on <Time> such as: proportion of municipal waste segregated: segregation training effectivieness(Time) segregation training effectivieness:[(0,0)-(20,10)],(0,1.7),(20,1.7) When I run the model, I see warning like this: WARN...

Hello, I have a question about copy/scale/zoom I want to copy and paste my model on an MS Word file as a picture to present the structure and names of the variables involved in the model. The problem is the model itself is big. As i want all the variables to look all together, i dont want to use sep...

JJ and Tom, Many thanks...

I tried to apply your ideas and modified the model (as attached). I hope this time I employed the functions correctly..Any ideas appreciated..

Nesli

Thank you so much indeed.. Regarding frequencies, I modified them by converting to average time it takes for somebody to be infected/died.. Regarding delays: you were quite right by saying that the sum of 2 outputs exceeds the level, thats why the level goes negative.. I suppose that I cannot use ex...

Hi, i am doing phd in Leeds University and my topic is related to waste management. I am using Vensim PLE as a method. I built a model (as attached) but having some troubles which is like having Population Stock negative under some certain set of data. Here it is: The aim is to make an estimation on...