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20120227-NodeXL-Twitter-#NICAR network graph
relationship advice

Image by Marc_Smith
Data set:

These are the connections among the Twitter users who recently tweeted the word #nicar when queried on February 27, 2012, scaled by numbers of followers (with outliers thresholded). Connections created when users reply, mention or follow one another. The data set starts on 2/21/2012 00:36 and ends on 2/27/2012 23:18 UTC. Green lines are "follows" relationships, blue lines are "reply" or "mentions" relationships.

Layout created with the "Group Layout" feature of NodeXL which tiles bounded regions for each cluster. The Harel-Koren layout algorithm positioned each vertex:

Clusters calculated by the Clauset-Newman-Moore algorithm are also encoded by color. Clauset-Newman-Moore algorithm is defined here:

A larger version of the image is here:

Betweenness Centrality is defined here:

Top most between users:

Top keyword pairs by frequency of mention
#nicar, conference, 7
golden, age, 6
open, source, 6
finally, put, 6
jquery, tablechart, 6
tablechart, plugin, 6
easy, charts, 6
html, tables, 6
tables, https, 6
google, maps, 5
jjkd, ltc, 5
first, #nicar, 4
ire, members, 4
members, share, 4
share, advice, 4
data, viz, 4
union, station, 3
data, journalists, 3
journalists, push, 3
open, data, 3

Graph Metric, Value
Graph Type, Directed
Vertices, 57
Unique Edges, 185
Edges With Duplicates, 65
Total Edges, 250
Self-Loops, 58
Connected Components, 9
Single-Vertex Connected Components, 8
Maximum Vertices in a Connected Component, 49
Maximum Edges in a Connected Component, 241
Maximum Geodesic Distance (Diameter), 7
Average Geodesic Distance, 2.825239
Graph Density, 0.053884712
Modularity, 0.32806
NodeXL Version,

More NodeXL network visualizations are here: and here:

A gallery of NodeXL network data sets is available here:

NodeXL is free and open and available from

NodeXL is developed by the Social Media Research Foundation ( – which is dedicated to open tools, open data, and open scholarship.

Donations to support NodeXL are welcome through PayPal:…

The book, Analyzing social media networks with NodeXL: Insights from a connected world, is available from Morgan Kaufmann and from Amazon.

Marc Smith on Twitter.

Battle of the Bulge: Achilles Tank (M10 Tank Destroyer)
relationship advice

Image by Dog Company
East of Bastogne is the Bastogne Historical Center and the Mardasson Memorial to the Battle of the Bulge. There is a collection of tanks there, including this one, an Achilles, better known as the M-10 Tank Destroyer.

The M-10 and the M-18 Tank Destroyers were really busy in Bastogne, fighting alongside Shermans and light tanks against the German panzer divisions. One of the interesting points is that General McAuliffe of the 101st Airborne (remember, General Taylor was back in the US when they were deployed) and Col. Roberts (I believe he was a Colonel) of the 10th Armored formed a working relationship after the fight at Noville so that the infantry of the 101st and the armored infantry and tanks of the 10th would be used optimally. They issued orders and advice to all of the commanders and that helped the Americans optimize the use of tanks. One of the lessons they learned was to keep the US tanks in a sort of reserve and deploy them up on the line when an attack occured, rather than to have them in a static position. That allowed the Americans to concentrate their armor in sectors where the Germans were attacking, in effect neutralizing the numerical advantage the Germans had. Luckily the Americans had just enough gasoline to pull this off. After any deployment, gasoline was drained from the American vehicles, including tanks, jeeps and trucks, in the event they were destroyed by artillery or aerial bombing. Then they’d be gassed up and sent into action. At the nadir, the Americans were down to 500 gallons of gas left, but the December 23rd air drop helped.


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