REPLY Do marginal models marginalize modeling? (SD6733)

[SDMAIL Bernard Liebowitz]

Posted by  "Bernard Liebowitz" <bernieliebowitz at comcast.net>

I am new to the world of System Dynamics.  The recent topic of marginal 
models has raised for me the question of the criteria by which one 
determines how marginal or good or comprehensive is a model.  Let’s 
assume you indeed follow John Sterman’s steps, you have interviewed all 
the stakeholders in the problem, you have drawn loops (positive and 
negative) based on these discussions, flow rates have been established, 
you have done root analyses, etc. What, then, determines the accuracy, 
goodness of fit, adequacy, representativeness, etc. of the resulting 
model?  And, maybe, the various criteria-related words I have used (e.g., 
comprehensive, accurate, etc.) themselves have different meanings with 
respect to a model?  I would appreciate any comments.

Bernie

Bernard Liebowitz, PhD, CMC
Liebowitz & Associates, PC
980 No. Michigan Ave., Ste. 1400
Chicago, Il   60611
Posted by  "Bernard Liebowitz" <bernieliebowitz at comcast.net>
posting date  Fri, 8 Feb 2008 14:08:00 -0600