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Re: statistical help

From:

Matt Wilkinson <[log in to unmask]>

Reply-To:

Matt Wilkinson <[log in to unmask]>

Date:

Mon, 26 Feb 2018 11:34:49 -0600

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 ```The calculation is very simple if you want to do it yourself. Using the Poisson distribution any time period which on average yields 3 events will have a 95% chance of yielding AT LEAST 1. http://stattrek.com/online-calculator/poisson.aspx Example: there were 70 school shootings with at least 1 death in the past 10 years in the US. Rate = 7/year. On average there are 3 every 5 months. So there is a 95% chance there will be at least one school shooting with a death in this country in the next 5 months. On average there will be 3. And yes this is morbid. So is the situation. Of course we could all move to Canada where apparently they have solved the problem of mental illness. MW > On Feb 26, 2018, at 9:57 AM, Brown, Julie <[log in to unmask]> wrote: > > Not to be morbid, but ... > > 1. Why would you base it on >10 deaths? I would say any with >2 deaths would qualify as “mass” in my book, assuming that with 3 deaths there are also multiple injuries. > > 2. 20 years seems like a long reference window given how steep the increase has been, why not make the reference time period something like the last three years? > > What do you get then? > > Julie > > Sent from my phone, please forgive brevity and typos. > >> On Feb 26, 2018, at 3:24 AM, Matthew Wilkinson <[log in to unmask]> wrote: >> >> Assuming your definition of mass school shooting, a poisson distribution, and Wikipedia's list of school shootings (0.3 per per year over the past 20 years with >= 10 deaths), there is a 95% chance that there will be a mass school shooting within the next 10 years. >> Wait, was that a rhetorical question?? >> MW >> >> On Sunday, February 25, 2018, 5:33:31 PM CST, Julian Orenstein <[log in to unmask]> wrote: >> >> I’m not a numbers guy, so I could use a little statistical help: >> >> What is the nearest date, with 95% probability, by which the next mass school shooting (arbitrarily >10) occurs? >> >> Julian Orenstein >> For more information, send mail to [log in to unmask] with the message: info PED-EM-L >> The URL for the PED-EM-L Web Page is: >> https://urldefense.proofpoint.com/v2/url?u=http-3A__listserv.brown.edu_ped-2Dem-2Dl.html&d=DwIFaQ&c=aBkXpkKi7gN5fe5MqrMaN-VmRugaRb1IDRfSv2xVRy0&r=LdGMXlGHIBSSsmyYogxTzCzExtS2cqT3uVO-vyNVnd8&m=lf35AMIy2F7WCEtK2OwQN_csLgvqFJsvMDr60zPGp84&s=cmAwA2Mjk1wkhsV_SNWKiFnq1L9PcQORSXJUwoHrGZk&e= >> >> For more information, send mail to [log in to unmask] with the message: info PED-EM-L >> The URL for the PED-EM-L Web Page is: >> https://urldefense.proofpoint.com/v2/url?u=http-3A__listserv.brown.edu_ped-2Dem-2Dl.html&d=DwIFaQ&c=aBkXpkKi7gN5fe5MqrMaN-VmRugaRb1IDRfSv2xVRy0&r=LdGMXlGHIBSSsmyYogxTzCzExtS2cqT3uVO-vyNVnd8&m=lf35AMIy2F7WCEtK2OwQN_csLgvqFJsvMDr60zPGp84&s=cmAwA2Mjk1wkhsV_SNWKiFnq1L9PcQORSXJUwoHrGZk&e= > CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information protected by law. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message. For more information, send mail to [log in to unmask] with the message: info PED-EM-L The URL for the PED-EM-L Web Page is:                  http://listserv.brown.edu/ped-em-l.html ```

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