9,405 research outputs found

    Collective behavior of El Farol attendees

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    Arthur’s paradigm of the El Farol bar for modeling bounded rationality and inductive behavior is undertaken. The memory horizon available to the agents and the selection criteria they utilize for the prediction algorithm are the two essential variables identified to represent the heterogeneity of agent strategies. The latter is enriched by including various rewarding schemes during decision making. Though the external input of comfort level is not explicitly coded in the algorithm pool, it contributes to each agent’s decision process. Playing with the essential variables, one can maneuver the overall outcome between the comfort level and the endogenously identified limiting state. The distribution of algorithm clusters significantly varies for shorter agent memories. This in turn affects the long-term aggregated dynamics of attendances. We observe that a transition occurs in the attendance distribution at the critical memory horizon where the correlations of the attendance deviations take longer time to decay to zero. A larger part of the crowd becomes more comfortable while the rest of the bar-goers still feel the congestion for long memories. Agents’ confidence on their algorithms and the delayed feedback of attendance data increase the overall collectivity of the system behavior

    The Effects of Selective and Indiscriminate Repression on the 2013 Gezi Park Nonviolent Resistance Campaign

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    We investigate the differential effects of selective and indiscriminate repression on the rate of protest actions during the nonviolent resistance campaign in Gezi Park, Turkey, in 2013. After deriving theoretical expectations about how and why these forms of repression will influence protest actions, we test them with protest event data that were collected from a major local newspaper and subsequently validated through a comparison with two other independent Twitter datasets. Utilizing a Poisson autoregressive estimation model, we find that selective repression, as measured by the number of arrested activists who were detained while they were not demonstrating, decreased the rate of protest actions. Meanwhile, indiscriminate repression, as measured by the frequency of the government’s use of lethal and nonlethal violence against protesters during demonstrations, increased the rate of protest actions. Our findings support prior research on the influence of indiscriminate repression on backfire outcomes. They also provide evidence for the impact of selective repression on movement demobilization through the removal of opposition activists. Finally, the targeted arrest strategy of selective repression that was employed in the Gezi campaign has implications for the feasibility of the strategic incapacitation model of protest policing

    Identification of appropriate temporal scales of dominant low flow indicators in the Main River, Germany

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    Models incorporating the appropriate temporal scales of dominant indicators for low flows are assumed to perform better than models with arbitrary selected temporal scales. In this paper, we investigate appropriate temporal scales of dominant low flow indicators: precipitation (P), evapotranspiration (ET) and the standardized groundwater storage index (G). This analysis is done in the context of low flow forecasting with a lead time of 14 days in the Main River, a tributary of the Rhine River, located in Germany. Correlation coefficients (i.e. Pearson, Kendall and Spearman) are used to reveal the appropriate temporal scales of dominant low flow indicators at different time lags between low flows and indicators and different support scales of indicators. The results are presented for lag values and support scales, which result in correlation coefficients between low flows and dominant indicators falling into the maximum 10% percentile range. P has a maximum Spearman correlation coefficient (ρ) of 0.38 (p = 0.95) at a support scale of 336 days and a lag of zero days. ET has a maximum ρ of –0.60 (p = 0.95) at a support scale of 280 days and a lag of 56 days and G has a maximum ρ of 0.69 (p = 0.95) at a support scale of 7 days and a lag of 3 days. The identified appropriate support scales and lags can be used for low flow forecasting with a lead time of 14 days
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