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Indiana University Bloomington

Operations & Decision Technologies

Kelley Advantage

Our Operations, Analytics and Information Systems faculty have written many of the definitive textbooks in the areas of operations, data analysis, database management, networking, and Excel modeling.

Recent Publications

Book Chapters

The Co-Evolution of Friendship and Leadership Networks in Small Groups


A. Mehra, J. Marineau, Alex B. Lopes, T. Dass


This study examines the dynamic interplay of friendship and leadership networks. We collected wholenetwork
panel data-- at two intervals, four months apart-- from all 25 members of a small group of elite
students at a large Midwestern university. Using the software program SIENA, we analyzed network
dynamics using a stochastic actor-based approach that modeled network change as a Markov process
evolving in continuous time. We found statistically significant differences in the structure and dynamics
of friendship and leadership networks at the dyadic, triadic, and network level of analyses. Our findings
offer new theoretical insights into how friendship and leadership relations co-evolve in an
interdependent work group.


Mehra, Ajay, Josh Marineau, Alexander B. Lopes, and Ted K. Dass (2009), "The Co-evolution of Friendship and Leadership Networks in Small Groups," in George Graen and Joan Graen (eds.), Predator's Game-Changing Designs, Charlotte, NC: Information Age Publishing.