Node connection strength in IOTree.
Each node in IOTree can be characterized by its mean distance from every other node. Below is a histogram of mean distances for every node in the tree. The final bin includes nodes that are not connected to the main tree. Note also that only individuals whose primary affiliation is this tree are included. Nodes cross-listed from other academic trees are included on their primary tree.

Mean inter-node distance

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Mean distance



20 most tightly coupled nodes.
Below are the IOTree nodes with shortest mean distance.

Rank Mean dist Name Institution Area Date
1 4646.35 Stephen J. Zaccaro (Info) George Mason University General Psychology, Behavioral Psychology, Ethnic and Racial Studies 2016-03-29
2 8549.28 C. Shawn Burke (Info) George Mason University Industrial Psychology, Management Business Administration 2016-03-30
3 9715.09 Steve Michael Jex (Info) University of Central Florida Occupational stress and wellbeing 2016-03-30
4 16440.9 YoungAh Park (Info) Bowling Green State University Industrial Psychology, Social Psychology, Individual and Family Studies 2016-03-30
5 106866 William Wooten (Info) University of Central Florida Industrial Psychology, Cognitive Psychology, Psychometrics Psychology 2016-05-28


Distribution of individual connectivity.
Another way to look at the IOTree graph is to plot a histogram of researchers (nodes) based according to the number of immediate connections (edges) they have to other researchers. The final bin includes nodes with 16 or more connections. The actual distribution has a very long tail, with a maximum of 45 connections. Thanks to Adam Snyder for suggesting this analysis!

Edge vs node distribution

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16+
Number of connections
 Node count