Search found 3 matches

by bffcosta
Wed Aug 10, 2016 1:35 am
Forum: System Dynamics Discussion
Topic: Dependent Variable Noise
Replies: 2
Views: 3392

Re: Dependent Variable Noise

John, I recommend you reading Appendix B of Business Dynamics (Sterman 2000) before modeling noise. I attached a possible structure you can use to model a first-order pink noise. Roughly speaking, pink noise is used when next value is in somehow dependent on previous one, it means that there is some...
by bffcosta
Wed Aug 10, 2016 12:34 am
Forum: System Dynamics Discussion
Topic: How to solve computing problem
Replies: 1
Views: 2715

Re: How to solve computing problem

Azri, good evening. This is your lookup function: [(0,0)-(52,1000)],(1,200),(25,250),(40,200),(52,150) It means that you are setting a lookup function for x varying from 1 to 52, and y varying from 150 to 1000 However, x = (Retailer inventory/average retailer inventory) is varying from 0 to 1053.06,...
by bffcosta
Mon Aug 08, 2016 10:53 pm
Forum: System Dynamics Discussion
Topic: How to model 2 stocks feeding a 3rd one through a single valve?
Replies: 1
Views: 3129

How to model 2 stocks feeding a 3rd one through a single valve?

Dear Messrs. good evening and best wishes. I am trying to build a model following the logic embedded on paper System dynamics applied to project management: a survey, assessment, and directions for future research by Lyneis and Ford. In their paper, they suggest that two stocks (Original Work to Do ...