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Quantifying individual influence in leading-following behavior of Bechstein’s bats
(2019)bioRxivLeading-following behavior as a way of transferring information about the location of resources is widespread in different animal societies. However, it cannot always be observed directly. Here, we develop a general method to infer leading-following events from observational data if only the discrete appearance of individuals is recorded. Our method further allows to distinguish such events from local enhancement at the resource, such as ...Working Paper -
Modeling User Reputation in Online Social Networks: The Role of Costs, Benefits, and Reciprocity
(2019)arXivWe analyze an agent-based model to estimate how the costs and benefits of users in an online social network (OSN) impact the robustness of the OSN. Benefits are measured in terms of relative reputation that users receives from their followers. They can be increased by direct and indirect reciprocity in following each other, which leads to a core-periphery structure of the OSN. Costs relate to the effort to login, to maintain the profile, ...Working Paper -
Data-driven modeling of leading-following behavior in Bechstein's bats
(2019)bioRxivLeading-following behaviour in Bechstein's bats transfers information about suitable roost sites from experienced to inexperienced individuals, and thus ensures communal roosting. We analyze 9 empirical data sets about individualized leading-following (L/F) events, to infer rules that likely determine the formation of L/F pairs. To test these rules, we propose five models that differ regarding the empirical information taken into account ...Working Paper -
Quantifying the Impact of Leveraging and Diversification on Systemic Risk
(2013)Excessive leverage, i.e. the abuse of debt financing, is considered one of the primary factors in the default of financial institutions. Systemic risk results from correlations between individual default probabilities that cannot be considered independent. Based on the structural framework by Merton (1974), we discuss a model in which these correlations arise from overlaps in banks’ portfolios. Portfolio diversification is used as a ...Working Paper