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For more recent work, here is Jonathan Goodwin's writeup of his process building network graphs of citation networks in various humanities journals (bibliometrics) along with links to the graphs themselves http://www.jgoodwin.net/octopress/blog/2013/09/06/creating-a-chronological-slider/

Ryan Cordell, David Smith, Elizabeth Maddock Dillon ""Infectious Texts: Modeling Text Reuse in Nineteenth-Century Newspapers," from Proceedings of the Workshop on Big Humanities. This project has already built an interactive network graphs that depicts text sharing between antebellum American newspapers: http://www.viraltexts.org/networks/1836-1860-wMagazines/index.html

Network BasicsIntro:What is a Network?

Binary of Nodes (Vertices, agents) a type of entity that is connected to other entities.

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Nodes can have particular attributes or categories attached to them as can edges . Thicknessand these are represented in varying thickness, colors, size sizes etc.

Because there’s no axis, the space between nodes is not meaningful, only the number of edges separating nodes determines “space.” Network graphs often take a “force directed” layout so the same visualization can take many different forms but meaning stays constant. “Force directed” is random, but generated so that edges act as springs, nodes are where springs are attached, laid out so that springs have least amount of tension.

Pitfall of basic network graph is lack of change over time, which is not so useful for a historian. Basic way to fix this is by having people working in the humanities. There are a few ways to get around this. The first is to build an “aggregate static network” where all time information is coded and included in one static graph, “this network over 100 years looks like X.” Dynamic Networks aggregate overtimeOne can trim down data by particular years or periods of time and build the various different graphs they represent and compare across multiple graphs. However, there is a way to include time splicing in graphs. One graph with a time slider is often referred to as a Dynamic Network, nodes that are there, stay there: time slices 1800-1850, 1800-1900, 1800-1950 etc. Or The Sliding scale, shows increments; network every 10 or 5 years. At some point you can’t make time smaller b/c because the network ceases to exist. You have to aggregate data/time at least somewhat.

Basic principles of networks

Dyad: two nodes connected by an edge. Reciprocated dyads: people talking, sharing, or unreciprocated, a one way relationship of sharing

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Undirected networks: all relationships are reciprocal. Like Facebook.(Think Facebook, you can't be friends with someone unless they are also friends with you)

Edge Weights: weights can be directed or undirected. Weights can be number of letters, length of phone call etc.

Bipartite Networks: Many network tools (like Gephi) are not really equipped to deal with these. It’s a network with 2 types of nodes. IE Books and authors. 1-4 authors, A-K books

These You CAN visualize these networks work on basic network tooltools, but what you get out of it isn’t perfectly clear. Most often when using these tools you will want to build unipartite graphs .(all of the nodes represent the same thing: facebook friends, places, letter writers)

What do does basic data tell us? Numbers of edges and nodes. Density: if you connected every node to every other node you would have X number of connections. How many connections do you actually have (no. of edges)= Y. Density=Y/X.

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Local clustering: how many of my friends are friends (connected) with each other. This goes hand in hand with modularity, think about "communities" or "groups of friends"

Modularity: groups, shared edges ,automated, algorithmic ways to detect communities.

Degree Distribution: what does the network look like as a whole based on their connections with one another.

Preferential attachment: if you have a lot of connections, you’re more able/likely to get more connections. Most social networks (Republic of Letters) you have a few people with lots of connections holding the network together, most people don’t have that many.Modularity: groups, shared edges (33:20ish) automated, algorithmic ways to detect communities.

Information Flow can vary: consider bibliometrics vs. history. Bibliometrics information is flowing from cited paper to the citing paper, hence the edge would be directed that way. A historian may be more interested in the opposite.

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Gephi: arguably the best all around network analysis tool for humanists, Gephi works mainly by importing CSV files through its "data tables" tab but there is a readily available plugin plugin for importing Excel spreadsheets as well (although this plugin can be a bit buggy and temperamental). Gephi has excellent visualization capabilities along with many different algorithmic analysis tools. Gephi is downloadable for free.

iGraph

Cytoscape

NWB

Pajek

Other more advanced tools include: iGraph, Cytoscape, NWB, Pajek, UCINet

 UCINet