Integer linear programming approaches to the blockmodel problem

Integer linear programming approaches to the blockmodel problem

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Article ID: iaor20084621
Country: Netherlands
Volume: 177
Issue: 2
Start Page Number: 840
End Page Number: 850
Publication Date: Mar 2007
Journal: European Journal of Operational Research
Authors:
Keywords: programming: integer, programming: nonlinear
Abstract:

Blockmodelling is a method for identifying structural similarities or equivalences between elements which has applications in a variety of contexts, including multiattribute performance assessment. One criterion for forming blocks results in a difficult non-linear integer program. We give several integer linear programming formulations of this problem and provide comparative computational results. We show that methods of reducing symmetry proposed by Sherali and Smith are not effective in this case and propose an iterative approach in which the size of the problem is reduced.

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