Search found 13 matches

by YahyaRafique
Thu Sep 23, 2010 2:40 am
Forum: Vensim
Topic: Sensitivity analysis input
Replies: 10
Views: 6474

Works like a charm! Thanks guys for the help :-)
by YahyaRafique
Mon Sep 20, 2010 8:27 pm
Forum: Vensim
Topic: Sensitivity analysis input
Replies: 10
Views: 6474

@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...
by YahyaRafique
Mon Sep 20, 2010 2:27 am
Forum: Vensim
Topic: Sensitivity analysis input
Replies: 10
Views: 6474

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, ...
by YahyaRafique
Tue Sep 07, 2010 10:24 am
Forum: Vensim
Topic: Using Discrete Distributions in Sensitivity Analysis
Replies: 5
Views: 3049

But how would I round to one decimal place...


I am trying to use a beta distribution and want to round generated values between O and 1 to to one decimal place..thanks in advance
by YahyaRafique
Tue Sep 07, 2010 3:38 am
Forum: Vensim
Topic: Using Discrete Distributions in Sensitivity Analysis
Replies: 5
Views: 3049

Thanks guys..
by YahyaRafique
Mon Sep 06, 2010 4:54 am
Forum: Vensim
Topic: Using Discrete Distributions in Sensitivity Analysis
Replies: 5
Views: 3049

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 ...
by YahyaRafique
Mon Apr 05, 2010 2:14 am
Forum: Vensim
Topic: Rounding the value of levels.
Replies: 3
Views: 2893

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
by YahyaRafique
Tue Mar 30, 2010 7:45 pm
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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...
by YahyaRafique
Tue Mar 30, 2010 12:07 am
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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...
by YahyaRafique
Mon Mar 29, 2010 10:43 pm
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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...
by YahyaRafique
Mon Mar 29, 2010 6:04 pm
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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...
by YahyaRafique
Mon Mar 29, 2010 4:56 am
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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
by YahyaRafique
Mon Mar 29, 2010 4:54 am
Forum: Vensim
Topic: New user with newbie problems..please help
Replies: 17
Views: 11455

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...