Blockmodels

Exploratory Social Network Analysis, Part V, Chapter XII

Modeling View Change

What’s the Advantage?

Definitions• Adjacency Matrix

• Incident Matrix 2-Mode Nets

• Isomorphic Network Renumbering

• Permutation

Defining the Clusters Blocks

Structural Equivalence • Complete Block• Null Block• Image Matrix

Core Periphery

Core Complete Complete

Periphery Complete Null with Error

Image MatrixShrunk Net

Dissimilarity

Dendrogram: hierarchical clustering

Dissimilarity Score

Example: Metal Exportation

Generalized Equivalence

Generalized BlockmodelingRegular Equivalence

• A regular block contains at least one arc in each row and in each column• Example: All the Ministers Advise PM

Advisors Must Advise at Least 1 Minister

User Defined

Adjacency MatrixDouble Click

Permutations: Operations > Partition + Permutation > Reorder Partition & Partition > Make a Permutation

DissimilarityCluster > Create Complete Cluster.Operations > Network + Cluster > Dissimilarity. Operations > Network + Cluster > Dissimilarity > Network based > Options > Report Matrix

BlockmodelingNetwork > Create Partition > Blockmodeling* Partitions > Info > Cramer’s V, Rajski.