Comments on: Assault Deaths Within the United States

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By: Assault Deaths Within the United States » Sociological Images « National-Express2011

Thu, 20 Dec 2012 03:19:15 +0000

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By: Ashby

Ashby — Wed, 19 Dec 2012 14:42:00 +0000

I’d like to see that last chart broken out by region. How much of the regional variation is simply reflective of the racial weighting of the population of young men?

By: Village Idiot

Village Idiot — Tue, 18 Dec 2012 16:28:00 +0000

Here’s one…

By: RudolfTheRedNoseReindeer

RudolfTheRedNoseReindeer — Tue, 18 Dec 2012 05:56:00 +0000

I’m sick of this gun crap. Where are all the Christmas posts?!

By: Lunad

Lunad — Tue, 18 Dec 2012 01:45:00 +0000

any serious analysis will take account of any demographic changes. However, you have to pick and choose with any tool what you offer. I suspect that the age adjusting is because of the extreme outliers of falling deaths among the elderly and suffocation deaths among infants. Because they are such extreme outliers they will change the numbers significantly.

By: decius

decius — Tue, 18 Dec 2012 01:35:00 +0000

So, when changes in population distribution cause changes in injuries, the effect is noise, but when changes in racial distribution cause such changes it is meaningful?

By: Lunad

Lunad — Tue, 18 Dec 2012 01:32:00 +0000

There is nothing inherent about racial differences in injury rates. However, as the body and mind ages, injury rates and types will naturally change – you don’t expect many drug poisoning deaths among infants, and you don’t expect many suffocation deaths among teenagers.

By: decius

decius — Tue, 18 Dec 2012 01:25:00 +0000

Some injuries occur more often among certain racial groups than others. Does that mean that racial adjustment is required to compare injury rates without concern that differences in racial distribution between different populations cause differences?

By: Lunad

Lunad — Tue, 18 Dec 2012 01:14:00 +0000

if you are doing a regression, you would absolutely want to take that into consideration. Also, the WISQARS system does age adjusting for all subgroups when you ask for comparisons. I don’t know if the data for regions is age-adjusted for region though. From the WISQARS documentation: “Some injuries occur more often among certain age groups than others. For instance, falls are more common among the elderly than among any other age group. Age adjustment enables you to compare injury rates without concern that differences are because of differences in the age distributions between different populations or for the same population over time.”

By: decius

decius — Tue, 18 Dec 2012 00:55:00 +0000

When comparing two different regions, are the demographic differences important, or are we asking “what would these regions be like if they had the same age distributions?”

By: Lunad

Lunad — Tue, 18 Dec 2012 00:35:00 +0000

to be fair, the original data source reports both rates. It is equivalent to reporting rates per capita – if the proportion of 80-year-olds is increasing, you would expect that deaths by assault would go down. If the population overall is increasing, you would expect that the number of violent deaths is increasing as well – but the change is not meaningful. The Wisqars system reports total deaths, unadjusted death rate, and age-adjusted death rate. So, if you only wanted to look at a small age range (15 to 19 year-olds) the unadjusted rate is appropriate. If you are looking at the whole population, then the age-adjusted rate is more meaningful to trends.

By: decius

decius — Tue, 18 Dec 2012 00:11:00 +0000

But… the intention is to show how assault rates change by region and over time. If there was a change in assault combined with a coincidental change in demographics, indicate that. If there was a change in demographics with no change in population or absolute assault rates, why should the assault rate change?

By: Lunad

Lunad — Mon, 17 Dec 2012 23:00:00 +0000

If I am remembering correctly, it is adjusting for the fact that assault rates are different among different age-groups, so that a demographic shift may look like a reduction in violence. It is weighted so that the proportion of each age-group stays constant over time.

By: Yrro Simyarin

Yrro Simyarin — Mon, 17 Dec 2012 21:29:00 +0000

The total number of black and white victims are practically equal despite the massive difference in population size. The number of black murderers is overall higher than the number of white murderers.

http://www2.fbi.gov/ucr/cius2009/offenses/expanded_information/data/shrtable_03.html