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I'm a little confused. It says that since 2006 an active shooting involving 4 or more people takes places every 2.9 months or for a yearly total of just over 4 a year. Then it goes to say that on average 20 mass shootings take places every year in the US which would be 1.667 per month. Maybe it's early but these numbers just don't add up. And if, say the average is taken from a larger pool then it appears that mass shootings are going down, or they are changing their critieria as they see fit. Or maybe its just early and I need coffee.
I would need to get access to the data to prove it but I believe they are including targeted gang shootings and drive-by's to get to this number or are simply fudging the "involved" to include people witnessing but not harmed. Reading the FBI active shooter study, it appears that a good number of the 160 cases cited do not "involve" 4 or more people killed or wounded.
FBI Study: http://www.fbi.gov/news/stories/201...r-incidents-in-the-u.s.-between-2000-and-2013
I believe they do mention the difference between concealment and cover but it is too quick to be effective only serving as a data point for those who already know