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Character network analysis
of Émile Zola’s
Les Rougon-Macquart
DH 2015, Sydney
Yannick Rochat, DHLAB, EPFL
● Nodes symbolize characters
● Edges symbolize proximity in the discourse
=> social network of characters
Character networks
● Most novels can be turned into networks
● Different orders, different sizes
● A network provides a signature of the novel
● Application of measures
Character networks
Character networks
Les Confessions, J.-J. Rousseau Sagas of Icelanders
Character networks
Character-space
Character-system
(Woloch, 2003)
Character network analysis
Plot analysis (Moretti, 2011)
Character network analysis
Character network analysis
Statistical physics approach
(Mac Carron & Kenna, 2012)
Extract features of novels.
Classify them based on :
– co-occurrences of characters
– protagonists / minor characters
Objectives
Les Rougon-Macquart
Les Rougon-Macquart
1. OCR (5min)
2. Manual/regex cleaning (10-15h)
3. Importation into R/igraph
4. Remove most obvious artefacts
First step: pages
Enumeration of co-occurrences on couples of
adjacent pages.
Same page gives 2 such co-occurrences : [n-1,
n] & [n, n+1].
Second step: threshold
(#co-occurrences > threshold T) => relation.
In practice, we consider : T = 3.
Betweenness centralization
Freeman, 1977
Betweenness centralization
Bavelas, 1950
Freeman, 1977
Betweenness centralization
“The k-core of a graph is a
maximal subgraph in which
each vertex has at least
degree k.
The coreness of a vertex is k
if it belongs to the k-core but
not to the (k+1)-core.” (Csardi,
2006)
Coreness
Coreness
Coreness
Classification through main protagonist and
cores of protagonists.
On this corpus, coreness and betweenness
centralisation highlight different properties.
Diversity within Zola’s narration.
Conclusion
Take into account weights of
edges for a better accurracy of
“coreness”.
How do we study interlocking
novels ? (Zola, Balzac, …)
Representation and study of
temporality.
Future works
Thank you!

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