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Austin's homicide rate spike (Updated)


by: Julio Gonzalez Altamirano

Sun Jan 16, 2011 at 11:34 PM CST


( - promoted by Karl-Thomas Musselman)

The Statesman recently highlighted an increase in homicides from 22 in '09 to 37 in '10.  While the piece provided a compelling visualization with the long-term count of homicides in Austin, it did not provide data that adjusted for the city's population growth.  In the chart below, I provide the number of homicides per 100,000 residents within the city's total area, as well as a 3-year trailing average.

Austin appears to have bottomed at around 2.8 homicides per 100k residents.  I wonder if the recent increase in rate volatility combined with the potential for a trailing average uptick in the near future is a result of more young men migrating into Austin, or perhaps a shift in the underlying community demographics towards a younger city.

Given the relatively high proportion of the City of Austin budget dedicated towards public safety, it seems feasible to ask for policymakers and APD to anticipate a demographic shift and begin putting programs (e.g. targeted after-school for boys with behavior issues at school) in place that can mitigate the effects of the shift.  A lot of our effectiveness in catching a potential wave will depend on the urgency placed on public safety risk management by the City Council.  I say 'risk management' because it's unclear if indeed there's a fundamental demographic transition that will make the days of 2.8/100k extremely difficult to repeat; however, the data should make us want to hedge against that possibility.  Hopefully, this chart gets the (some?) conversation started.

Here's my data file in XLSX format (AtxHomicideRate) .  Population numbers come from the City demographer's website.

*UPDATE

In response to the comments section, I've created a visualization of recent crime data from APD in the other leading violent categories:

I think this data reiterates the value of local government considering risk management and/or examining how optimally public safety resources are deployed.  The totals in these categories are indeed much larger and less likely to be distorted by randomness, so the slight but steady increases in aggravated assault and burglary should be noted.

Cross-posted at Keep Austin Wonky. Follow Julio on twitter: @juliogatx.

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Take the jump with a grain of salt (0.00 / 0)
While a change from 37 to 22 homicides sounds like a lot (and the importance of 15 lives should never be minimized), it's well within the range of statistical fluctuation. Random jumps up or down by 15 or more should happen about once per decade. [For the statistics wonks out there: The number of any unusual event (like murders) should be described by a Poisson distribution. If there are an average of (say) 30 murders per year, then you should expect anywhere from the low 20s (last year's rate) to the high 30s (this year's rate) in any given year. The standard deviation in the difference from one year to the next is about 8.]

I'm not saying that the change in the overall murder rate IS just noise. Maybe it is, and maybe it isn't. There just isn't enough data to tell. That's why crime rates for cities are usually calculated based on robberies or assaults. Those crimes are not as important as murder or rape, but the statistics on them are much more robust.

If you break the data down further, by domestic violence vs. street violence, there is a big jump in domestic murders from 1 to 13, and a small change in murders outside the home, from 21 to 24.

My read is that the streets are no more dangerous than they were a year ago, but that people have generally grown more bitter as hard times continue, and are more likely to take their frustrations out on family and friends. If that's true, then it's not clear what, if anything, the City Council or APD can do about it.  


Typo -- I meant change from 22 to 37, not from 37 to 22. (0.00 / 0)


[ Parent ]
Good point (0.00 / 0)
I've provided some additional data.  I think there is still a not insignificant probability that a potential shift might be happening.  I disagree that "it's not clear" what a community facing Austin's predicament can do.

There are a variety of operational tactical decisions that might not be optimal now (e.g. changing force composition, changing the allocation of detective resources, changing the allocation between response to calls and pro-active intelligence gathering), as well as strategic choices (spending on an additional patrol FTE vs. targeted social programs) that might benefit from reconsideration.  I guess I just think there's probably still some opportunities to create public value on the table.  

I am willing to be convinced otherwise by some data.



www.keepaustinwonky.wordpress.com + www.twitter.com/juliogatx


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