Visualizing THATCamp

THATCamps are quite popular. I’m throwing one myself. But who are the people talking about them on Twitter? What does the THATCamp look like on the Twitterverse? I used NodeXL to retrieve the data – a search for tweets, people, and the links between them. I then visualized the data in Gephi, where colour = community (per Gephi’s modularity routine) and sized the nodes (individual Twitterers) using Pagerank, on the premise that this was a directed graph and one should follow the links (although there was little difference with Betweeness Centrality. Major players are still major, either way). I found … Continue reading Visualizing THATCamp

Artefact Networks Analysis – Thinking Out Loud

What follows is a process of me thinking out loud whilst working with data related to the Tiber Valley Brick Industry. If we look at the distribution of stamped bricks across the Tiber Valley (as collected by the BSR), we can work out some of the implications for production and consumption by considering the way location, stamp type, and fabric of the brick intersect. I looked at every combination for every site in the South Etruria Survey, having done archaeometric analysis on the same collection to the point where I could say that ‘these two bricks share the same fabric’. … Continue reading Artefact Networks Analysis – Thinking Out Loud

The Tiber Valley Brick Industry as Two Mode Network

From the first to third centuries AD, the brick manufactories in the Tiber Valley around Rome made millions of bricks. A proportion of these carry makers’ marks, with many different dimensions of information – the brick maker; the estate; the landowner; the year; and various decorative features which may or may not be signficant. I worked on this material for my PhD thesis (which these days makes me cringe when I look at it). I’ve been reconsidering that work lately, especially in light of recent work by Malkin, Knappet, Brughmans, and of course the interest in digital humanities in networks … Continue reading The Tiber Valley Brick Industry as Two Mode Network

Towards the computational study of the Roman economy: draft

I’m contributing to a volume on  ‘Land and Natural Resources in the Roman World’. Below is my draft, on which I welcome comments and questions. Towards the computational study of the Roman economy Shawn Graham, Carleton University, Ottawa Canada “Economies are complicated systems encompassing micro behaviours, interaction patterns, and global regularities. Whether partial or general in scope, studies of economic systems must consider how to handle difficult real-world aspects such as asymmetric information, imperfect competition, strategic interaction, collective learning, and the possibility of multiple equilibria. Recent advances in analytical and computational tools are permitting new approaches to the quantitative study … Continue reading Towards the computational study of the Roman economy: draft

Converting 2 mode networks with Multimodal plugin for Gephi

Scott Weingart drew my attention this morning to a new plugin for Gephi by Jaroslav Kuchar that converts multimodal networks to one mode networks. This plugin allows multimode networks projection. For example: you can project your bipartite (2-mode) graph to monopartite (one-mode) graph. The projection/transformation is based on the matrix multiplication approach and allows different types of transformations. Not only bipartite graphs. The limitation is matrix multiplication – large matrix multiplication takes time and memory. After some playing around, and some emails & tweets with Scott, we determined that it does not seem to work at the moment for directed … Continue reading Converting 2 mode networks with Multimodal plugin for Gephi

Review of Malkin, “A Small Greek World: Networks in the Ancient Mediterranean”

A Small Greek World Networks in the Ancient Mediterranean Irad Malkin OUP USA 304 pages | 21 illustrations | 235x156mm 978-0-19-973481-8 | Hardback | 24 November 2011 Price: £40.00 I was excited to obtain this book. Unfortunately, this is a book about social network analysis in antiquity that does not, in point of fact, contain any social network analysis. Rather, Malkin uses concepts drawn from networks and theories of evolving networks as metaphors to reframe centre-periphery arguments about the emergence of the Greek world around the Mediterranean as a ‘small world’. There is much that is good with this book, … Continue reading Review of Malkin, “A Small Greek World: Networks in the Ancient Mediterranean”

Artefacts as Nodes in a Network II

4th – 6th century stamped bricks connected by virtue of use in the same location, around Constantinople In these two one-mode networks (generated from Jonathan Bardill’s study of the brickstamps of Constantinople), colour indicates modularity class, while size indicates betweeness centrality. What network measures are most appropriate for understanding archaeological networks? Continue reading Artefacts as Nodes in a Network II

Converting 2-mode networks to 1-mode networks

April 4th: There is now a plugin for Gephi which will convert from multi-modal to 1-mode networks: Say you’re interested in patterns of communication between individuals who are members of multiple organizations (like for instance historical societies), or artefact types across multiple sites. You might like to map the network between these individuals and those organizations to understand something of how information flows in that world, how social norms permeate, or ideologies of consumption or display map across space (as Tom Brughmans does here and I’ve done in other places). You’ll need Gephi and Sci2. Download and install these. Registration … Continue reading Converting 2-mode networks to 1-mode networks

Artefacts as Nodes in a Network

I’m working on a paper for a conference next month. In it, I consider artefact copresence at various sites as a means for generating networks, in an effort to get at some of the ideological or social frameworks underpinning the distribution of these networks. I’m looking at stamped brick from Constantinople. I create a list where each entry is a site and a single example of a stamped brick. These I can then visualize using Gephi, and using Sci2 I can convert the two mode network (brick – place) to two one mode networks (bricks – bricks, tied because they’re … Continue reading Artefacts as Nodes in a Network

Topic Modeling With the JAVA GUI + Gephi

I’ve been having an interesting conversation with Ben Marwick, in the comments thread of my initial ‘Getting Started with Topic Modeling’ post. Ben pointed me to an interesting GUI for Mallet, which may be downloaded here. I’ve been trying it out this morning, and I like what I’m seeing. Topic modeling is becoming more and more popular amongst the Digital Humanities crowd. An interesting automated approach to generating networks of topics and ideas from texts is reported by Scott Weingart, using the writings of Newton. While I have nothing near so polished available, the GUI for Mallet used with Gephi … Continue reading Topic Modeling With the JAVA GUI + Gephi