Search found 13 matches
- Thu Sep 23, 2010 2:40 am
- Forum: Vensim
- Topic: Sensitivity analysis input
- Replies: 10
- Views: 6639
- Mon Sep 20, 2010 8:27 pm
- Forum: Vensim
- Topic: Sensitivity analysis input
- Replies: 10
- Views: 6639
@Administrator: There is no support in the software for reading parameters values, it only allows reading of output from the simulation. Hence I have to try to reach a workaorund in Vensim. I don't have access to Vensim DSS which is why this is an issue. The software I am using for stats purposes, S...
- Mon Sep 20, 2010 2:27 am
- Forum: Vensim
- Topic: Sensitivity analysis input
- Replies: 10
- Views: 6639
Sensitivity analysis input
Hi all, I have purchased the PLE Plus version of Vensim. My objective is to evaluate the "degree of influence" of each parameter in the sensitivity analysis on one of of my output variables. Unfortunately the statistical software that I have does not support the input of parameter values, ...
- Tue Sep 07, 2010 10:24 am
- Forum: Vensim
- Topic: Using Discrete Distributions in Sensitivity Analysis
- Replies: 5
- Views: 3111
- Tue Sep 07, 2010 3:38 am
- Forum: Vensim
- Topic: Using Discrete Distributions in Sensitivity Analysis
- Replies: 5
- Views: 3111
- Mon Sep 06, 2010 4:54 am
- Forum: Vensim
- Topic: Using Discrete Distributions in Sensitivity Analysis
- Replies: 5
- Views: 3111
Using Discrete Distributions in Sensitivity Analysis
Dear all, I am trying to run a sensitivity analysis where some of the parameter I am using a discrete distribution rather than a continuous one. for example I want a discrete random uniform distribution in the range [30,60] that select whole numbers only like 32,48,51 etc. How would I do this for a ...
- Mon Apr 05, 2010 2:14 am
- Forum: Vensim
- Topic: Rounding the value of levels.
- Replies: 3
- Views: 2923
Rounding the value of levels.
Hey guys
Is there a way of rounding the value of levels to for example 2 decimal places?
Regards,
YR
Is there a way of rounding the value of levels to for example 2 decimal places?
Regards,
YR
- Tue Mar 30, 2010 7:45 pm
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
Thanks Tom and JJ, I now understand the instantaneous nature of the loop mentioned. Unfortunately I can't change the model as it exists. When I used the simultaneous function I was getting errors only when numbers were really small. When I set the overall flow to be higher and set a minimum threshol...
- Tue Mar 30, 2010 12:07 am
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
Thanks Tom for looking at the model. Thank you for incorporating the good practice as well. The fundamental question as you noticed is the rate to rate connection. Incorrect to your assuption the rate cycle does not happen instantaneously although the value are so small that this is being done in on...
- Mon Mar 29, 2010 10:43 pm
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
Hey JJ, Thanks for the reply. I know my model was missing units. I figured that I will enter them in the end after the whole diagram was complete. As for your suggestion of using the Simultaneous function, I did use it in fact and got some wrong values which I have attached to one of my earlier post...
- Mon Mar 29, 2010 6:04 pm
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
Thank you for your help with providing references to models but I really cannot use any other model. I have been working with my professor for two weeks on this and changing it is not a feasible option....Can somebody please look at my model and tell me what's wrong...or maybe even a detailed descri...
- Mon Mar 29, 2010 4:56 am
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
Add-ons
To make it easier to look at I am attaching a spreadsheet of values taken as export from Vensim...I have highlighted wrong values in red.....again please help me
- Mon Mar 29, 2010 4:54 am
- Forum: Vensim
- Topic: New user with newbie problems..please help
- Replies: 17
- Views: 11609
New user with newbie problems..please help
Hi all, I am using for the first time for a masters level Computer Science project. I was simulating the traditional waterfall software development model and had to create an iterative loop to model the life cycle. On reading the reference manuals and looking at the samples I figured it involved the...