Police: NorCal man kills mother over video game anger

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17. Both studies examined the correlation between the sales or release

of video games and the incidence violent crime. Neither of those studies sought to measure the correlation between long-term or frequent playing of violent video games and a likelihood towards engaging in violent crime.

Our study uses a quasi-experimental methodology to identify the short and medium run effects of violent game sales on violent crime using time variation in retail unit sales data of the top 50 selling video games and violent criminal offenses from the National Incident Based Reporting System (NIBRS) for each week of 2005 to 2008.

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1804959

Using a similar methodology employed by researchers to examine predictors of severe violent behaviors (Anderson et al., Journal of Personality and Social Psychology 73: 1213–1223, 1997), 4 time-series analyses investigated the associations among violent crime (homicides and aggravated assaults), video game sales, Internet keyword searches for violent video game guides, and the release dates of popular violent video games (both annually and monthly). Contrary to the claims that violent video games are linked to aggressive assaults and homicides, no evidence was found to suggest that this medium was positively related to real-world violence in the United States

http://psycnet.apa.org/doiLanding?doi=10.1037%2Fppm0000030