Loops are defined as positive, if the number of negative relationships is even. They are called negative if the structure contains an odd number of negative correlators.
The structure shown in the right contains three loops (ABCDA, BCDB and ABCEA). In this example on the left the loops ABCDA and ABCEA are positive; The loop BCDB is negative.
- ↑ Juan Martín García (2011), Theory and Practical Exercises of System Dynamics, Barcelona, Spain: Juan Martín García, ISBN 8460998045, 8460998045, http://openlibrary.org/books/OL25175096M/Theory_and_Practical_Exercises_of_System_Dynamics
Additional information Edit
- Franklin GF, Powell JD, Emami-Naeini A. Feedback Control of Dynamic Systems. Delhi: Pearson Education, 2002. ISBN 8178086751