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Below you will find links to software I have written, and copies of past research presentations.  If you are interested in any of these projects or if they are related to something you are currently working on, I'd like to hear from you.

Interactive Models –
These are interactive models and tools written in NetLogo.  They require Java to run.

Random Network Simulator – This model reports the mean clustering coefficient and characteristic path length for random networks with a given number of nodes and edges.  These values provide a baseline comparison when determining whether an observed network is a "small-world network".

Neighborhood Network Simulator – This model simulates the formation of social networks among residents in a neighborhood.  It allows neighborhoods to vary in terms of density, segregation, and diversity.  The formation of relationships among residents is driven by homophily and proximity.  It is described in detail in:
Neal, Zachary and Jennifer Watling Neal. Forthcoming. "The (In)compatibility of Diversity and Sense of Community." American Journal of Community Psychology[PDF]  [SUPPLEMENTARY FIGURE]  [VIDEO OF PRESENTATION TO THE ROYAL SOCIETY]

Air Traffic Network Data –
These data contain annual U.S. air traffic flow networks from 1993 to 2011.  They were constructed from Bureau of Transportation Statistics' Origin and Destination Surveys using the AIRNET program (see below).  Each comma-delimited file contains four different types of networks: route, origin-destination, business, and leisure. – Nodes are individual US airports – Nodes are CSAs and MSAs based on 2009 definitions

Please cite:
Neal, Zachary. Forthcoming. "AIRNET: A Program for Generating Intercity Networks." Urban Studies.  [PDF]
Neal, Zachary.  2010.  "Refining the Air Traffic Approach: An Analysis of the US City Network."  Urban Studies 47: 2195 – 2215.  [PDF]

Software –
These are user-written commands for use in the Stata statistical analysis software.  The links below provide some additional information.  To install a command, type "ssc install <name of command>" in the Stata command line.  Once a command is installed, for instructions on using it, type "help <name of command>".

Research Presentations –
Tinbergen Workshop (Amsterdam)
"Making big cities small: Behavioral and environmental requirements for the formation of small world networks"  [SLIDES]

International Network for Social Network Analysis, Sunbelt (St. Pete Beach)
"The backbone of bipartite projections"  [SLIDES]
"Perceptions of same-sex, opposite-sex, and cross-sex classroom relationships in middle childhood: gender, grade, and transitivity effects."  [SLIDES]

William T. Grant Foundation Research Evidence Meeting (Washington DC)
"To “make” or “buy” research evidence: applying transaction cost economics
theory to public schools."  [SLIDES]
"Intermediaries in the transfer of research evidence from “producers” to “consumers”: the case of school-based programs."  [SLIDES]

American Sociological Association (New York)
"The Paradox of Integration and Cohesion: A Micro-sociological Explanation"  [SLIDES]
"There's More Than One Way to Build a World City Network"  [SLIDES]
"Identifying Statistically Significant Edges in One-mode Projections"  [SLIDES]

Society for Community Research and Action (Miami)
"Nested or Networked? Rethinking Ecological Systems Theory"  [SLIDES]
"The (In)compatibility of Diversity and Sense of Community"  [SLIDES]  [INTERACTIVE MODEL]

Royal Society for the Arts (London)
"Are Diverse Communities Possible?"  [SLIDES]    [AUDIO]    [INTERACTIVE MODEL]

Bridging the Gaps – Network Research Group (Swansea)
"Urban Networks: Micro & Macro"  [SLIDES]

Society for Research on Child Development (Seattle)
"I Know Who My Friends Are, But Do You? Comparing Predictors of Real and Inferred Relationships"  [SLIDES]

Association of American Geographers (Los Angeles)
"Comparing Airline Traffic Networks by Scale, Species, and Season"  [SLIDES]

Global Institute of Sustainability Workshop on Urban Networks, Sustainability, and Resilience (Tempe)
"Measurement and Metabolism in Air Traffic Networks"  [SLIDES]

INSITE Workshop on General Processes of Networks' Emergence and Sustainability (Venice)
"Formation and Sustainability of Dynamic Urban Networks"  [SLIDES]

American Sociological Association (Denver)
"The Urban Metabolism of Airline Passengers: Scaling & Sustainability"  [SLIDES]

International Network for Social Network Analysis, Sunbelt (Redondo Beach)
"Identifying Significant Linkages in One-mode Projections"  [SLIDES]

Association of American Geographers (New York)
"Intercity Linkages in the Interlocking World City Network: How Strong is Strong Enough?"  [SLIDES]


Great Cities – Ordinary Lives (Chicago)
"Secret Gardens: Locating and Understanding Hidden Public Spaces" [SLIDES]

Society for Community Research and Action (Chicago)
"Community: Place, Population, or Pattern?"  [SLIDES]

Transforming Transportation Research Corridor Consortium (Detroit)
"The Role of Transportation Networks in Urban Growth, Jobs and Sustainability" [POSTER]

International Network for Social Network Analysis, Sunbelt (St. Pete Beach)
"Comparing Beta Centrality and a Modified Degree Centrality"   [SLIDES]

Association of American Geographers (Washington DC)
"From Central Places to Network Bases: A Transition in the Urban Hierarchy, 1900 – 2000" [SLIDES]

American Sociological Association (Atlanta)
"The Causal Relationship Between Employment and Business Networks in US Cities"  [SLIDES]

American Psychological Association (San Diego)
"Channels of Change: Contrasting Network Mechanisms in Intervention Use"  [SLIDES]

Michigan Higher Education Land Policy Consortium (Michigan State)
"Common Ground: Understanding Public Spaces"  [SLIDES]  [RECORDING]

Global Urban Studies Workshop (Michigan State)
"Using Airline Traffic to Understand Intercity Networks"  [SLIDES]

American Sociological Association (San Francisco)
"Refining the Air Traffic Approach" [SLIDES]

City as System Mini-Conference (University of Toronto)
"Why Networks Matter for Cities"  [SLIDES]

American Sociological Association (Boston)
"From Central Places to Network Bases"  [SLIDES]

American Sociological Association 2007 (New York)

"The Duality of World Cities and Firms"  [SLIDES]