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Related Experiment Video

Updated: Jun 13, 2026

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

Neighborhood Shocks and Network Dynamics: An Instrumental Variable Approach to Measuring Triadic Closure in Daily

Karl Vachuska1, Clayton Adamson1

  • 1University of Wisconsin-Madison.

Social Networks
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Neighborhood mobility networks show "triadic repulsion," not closure. When two neighborhoods share a destination, direct travel between them decreases, challenging network theory assumptions.

Keywords:
causal network analysisinstrumental variablesmobility networksneighborhood effectstriadic closure

Related Experiment Videos

Last Updated: Jun 13, 2026

Trajectory Data Analyses for Pedestrian Space-time Activity Study
16:14

Trajectory Data Analyses for Pedestrian Space-time Activity Study

Published on: February 25, 2013

Area of Science:

  • Urban studies
  • Network science
  • Computational social science

Background:

  • Everyday mobility data are crucial for neighborhood research.
  • Existing studies often overlook higher-order structures in mobility networks, focusing on dyadic ties.
  • The concept of triadic closure, where shared connections strengthen relationships, is a key network theory principle.

Purpose of the Study:

  • To investigate the causal role of triadic closure in neighborhood mobility networks.
  • To determine if increased shared destinations between neighborhoods lead to stronger direct mobility flows between them.
  • To challenge conventional network theory by examining higher-order structures in mobility.

Main Methods:

  • Utilized longitudinal smartphone trace data (SafeGraph) to build neighborhood-to-neighborhood mobility networks for U.S. census tracts.
  • Defined triads where two 'alter' neighborhoods jointly visit a 'focal' neighborhood experiencing a major employer opening.
  • Employed employer openings as an instrumental variable for exogenous increases in joint visits, estimating the effect on subsequent direct mobility flows between alters.

Main Results:

  • Found evidence of 'triadic repulsion' rather than triadic closure.
  • Exogenous increases in joint visits to a focal tract significantly reduced direct mobility between alter tracts.
  • Observed larger negative effects for 'bridged' dyads (where the focal tract lies on the shortest path) and null effects for non-bridged dyads.

Conclusions:

  • Shared mobility hubs can consolidate activity rather than foster connections between neighborhoods.
  • Results challenge standard closure-based intuitions in network theory.
  • Highlight the necessity of modeling everyday mobility networks as complex, higher-order systems.