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Collective Behavior of In-group Favoritism

Meysam Alizadeh, Claudio Cioffi-Revilla, Andrew Crooks
Submitted By: malizade
Submitted: Aug 24, 2014
Last Updated: Sep 1, 2015
221 Downloads (15 Downloads in the last 3 months)

We define two levels of uncertainties for each agent. First is the uncertainty associated with in-group members’ opinion (Uin), and second is the uncertainty associated with out-group agents’ opinion (Uout) where Uin ≥ Uout. In each interaction encounters, the agents follow the same steps as 2D BC model except that if they are from the same group, they use their in-group uncertainty (Uin) to update their opinion (i.e. attraction, rejection, or ignorance). Similarly, if two agents are from different groups, they use their out-group uncertainty (Uout) for opinion updating purpose.

This model is associated with a publication:

Meysam Alizadeh, Claudio Cioffi-Revilla, and Andrew Crooks (2015) The Effect of In-Group Favoritism on the Collective Behavior of Individuals’ Opinions. Advances in Complex Systems, 18.

Cite This Model:
Alizadeh, Meysam, Cioffi-Revilla, Claudio, Crooks, Andrew (2015, September 1). "Collective Behavior of In-group Favoritism" (Version 1). CoMSES Computational Model Library. Retrieved from:
Model Version: 1 [Latest]
Version Notes:

Programming Language: Python 2.7
Operating System: Microsoft Windows
Licensed Under: Academic Free License 3.0
Instructions on Running This Model:

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