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Evolution and study of a copycat effect in intimate partner homicides: A lesson from Spanish femicides

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Abstract
Objectives: This paper focuses on the issue of intimate partner violence and, specifically, on the distribution of femicides over time and the existence of copycat effects. This is the subject of an ongoing debate often triggered by the social alarm following multiple intimate partner homicides (IPHs) occurring in a short span of time. The aim of this research is to study the evolution of IPHs and provide a far-reaching answer by rigorously analyzing and searching for patterns in data on femicides. Methods: The study analyzes an official dataset, provided by the system VioGen of the Secretarla de Estado de Seguridad (Spanish State Secretariat for Security), including all the femicides occurred in Spain in 2007-2017. A statistical methodology to identify temporal interdependencies in count time series is proposed and applied to the dataset. The same methodology can be applied to other contexts. Results: There has been a decreasing trend in the number of femicides per year. No interdependencies among the temporal distribution of femicides are observed. Therefore, according to data, the existence of copycat effect in femicides cannot be claimed. Conclusions: Around 2011 there was a clear change in the average number of femicides which has not picked up. Results allow for an informed answer to the debate on copycat effect in Spanish femicides. The planning of femicides prevention activities should not be a reaction to a perceived increase in their occurrence. As a copycat effect is not detected in the studied time period, there is no evidence supporting the need to censor media reports on femicides.
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This article has a Correction in: PLoS ONE 14(10):e0224840. https://doi.org/10.1371/journal.pone.0224840 The following information is missing from the Funding statement: The work by Quijano-Sanchez has been supported by the Spanish Ministry of Science and Innovation grant FJCI-2016-28855.
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Bibliographic citation
Torrecilla J. L., Quijano-Sánchez L., Liberatore F., López-Ossorio J. J., González-Álvarez J. L. (2019). Evolution and study of a copycat effect in intimate partner homicides: A lesson from Spanish femicides. PLoS ONE 14(6): e0217914.