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Stuart_Armstrong comments on No peace in our time? - Less Wrong Discussion

9 Post author: Stuart_Armstrong 26 May 2015 02:41PM

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Comment author: Stuart_Armstrong 27 May 2015 09:39:05AM 1 point [-]

Pinker argues that all types of violence are going down. Cirillo and Taleb deliberately chose to ignore homicides:

We avoided discussions of homicide since we limited L to values > 10, 000, but its rate doesn’t appear to have a particular bearing on the tails. It could be a drop in the bucket. It obeys different dynamics. We may have observed lower rate of homicide in societies but most deaths risks come from violent conflict.

I'd note that they chose to ignore homicides, and it seems that homicides undermine their general point.

Comment author: theseus 29 May 2015 09:06:27AM 2 points [-]

Pretty sure I remember reading Taleb on this, stating that homicides follow a normal distribution and he accepts Pinker's argument there. He de-couples this from the other kinds of violence, saying that the narrative stretches too wide--specifically warfare should be analyzed separately, since that follows Pareto distributions.

Comment author: Stuart_Armstrong 29 May 2015 02:15:13PM 0 points [-]

That's fine.

Comment author: VoiceOfRa 28 May 2015 03:37:17AM 0 points [-]

I'd note that they chose to ignore homicides, and it seems that homicides undermine their general point.

I'm not sure about that. The whole concept that inner cities are dangerous no-go zones is recent. In Victorian London one mugging every couple months was considered a crime wave.

Comment author: Stuart_Armstrong 28 May 2015 09:01:51PM 0 points [-]

I'm not sure about that. The whole concept that inner cities are dangerous no-go zones is recent. In Victorian London one mugging every couple months was considered a crime wave.

I believe that is incorrect - London used to be a fantastically violent city.

But the reason I suspected it undermined their case is that they said "We may have observed lower rate of homicide in societies but most deaths risks come from violent conflict." in the paper.

Comment author: Lumifer 28 May 2015 09:11:56PM 2 points [-]

Hey, look -- data :-)

Comment author: Nornagest 28 May 2015 10:11:05PM *  0 points [-]

Interesting. But there's a couple of features in there that make me leery of relying on this.

First, the table there is tracking convictions at jury. Clearance rates, especially for property crime, have never to my knowledge been high; if we assume similar figures they'd be undercounting reported crimes (most comparable to the crime statistics we're familiar with) by a factor of three to five, and undercount committed crimes by more. That isn't necessarily a good assumption, though, and there's the rub: we can't use conviction rates to estimate crime rates unless we know something about how likely cases were to make it through the system.

Second, buried in the bottom of that page there's a sentence saying that about 17,000 summary convictions (excluding some minor fines) were imposed independently by police magistrates. No information on type, which means the table would further undercount crimes by some unknown proportion depending on how likely summary punishment was. But 17,000 is roughly four times the total jury convictions cited, so it'd probably be large.

I haven't been able to find another source going back to the 1830s yet, but this data suggests that as many murders were recorded in London in the late Victorian era as in the mid-Sixties, when population was about 20% higher. (Population in 1838 was much lower -- the city grew hugely over the 19th century.)

Comment author: Lumifer 29 May 2015 02:18:12PM 1 point [-]

Well, I don't have an intimate relationship with this data, this was only a Google quickie :-D But I think NRx made a big deal out of the safety (as they claimed) of Victorian London and it's something they bring up regularly. It might have started with Mencius Moldbug, but I'm too lazy to go looking for the original write-up which, IIRC, included some data analysis.