Tag Archives: nevin

Lead Update: White Folks and Alabama Prisoners

by FredRuppmuit Posted on March 27, 2017

Mother Jones

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It’s been…weeks, at least, since I’ve mentioned lead and crime, and today I got two nice little anecdotes at once. The first is from lead researcher extraordinaire Rick Nevin, who directs our attention to this chart:

As predicted by the lead-crime theory, the prison population of younger cohorts (15-25) has dropped the most. The 26-30 cohort is flat, and the older cohorts are making up a bigger proportion of the total prison population. Why? Because everyone under 30 grew up in a fairly lead-free environment, so they’re less likely to commit serious crimes than similar cohorts in the past. 35-year-olds grew up at the tail end of the lead era, and are still moderately crime prone. Older cohorts were heavily lead poisoned as kids, and they’ve remained more crime prone even as they’ve grown older.

If you have a good memory, you may also recall a post I wrote four years ago explaining that lead poisoning affected blacks and Hispanics more than whites because they were more likely to grow up in dense urban environments with a lot of auto exhaust. Because of this, during the great crime wave of the 60s and 70s, their crime rates went up faster than white crime rates. The flip side of this is that with lead mostly gone, their crime rates are dropping faster than they are for whites. We can see this in the declining share of the jail population made up by blacks and Hispanics. Keith Humphreys shows us the mirror image of this, the rising share of the jail population made up by whites:

The lead hypothesis predicts that young cohorts are less crime prone than older cohorts, so their share of the jail and prison population should decline. It predicts that black crime rates will drop faster than white crime rates. And it also predicts that small-city crime rates will drop faster than big-city crime rates. All of these things have turned out to be true.

Read this article:

Lead Update: White Folks and Alabama Prisoners

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2015: The Great Crime Wave That Wasn’t

by HassanE54kqinqhe Posted on December 29, 2016

Mother Jones

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Was there a huge crime wave in 2015? There are two main sources for crime rates in the United States. The FBI produces the Uniform Crime Report (UCR), which is based on reporting from police agencies. The Bureau of Justice Statistics produces the National Crime Victimization Survey (NCVS), which conducts surveys of ordinary Americans and asks if they’ve been a crime victim in the past year. Rick Nevin breaks down the numbers:

The 2015 NCVS property crime rate (household burglary, motor vehicle theft, and other theft) was down 6.3% from 2014…2015 UCR burglary rate…down 8.5%…UCR larceny-theft rate…down 2.5%…UCR property crime rate…down 3.4% from 2014….roughly consistent with the NCVS data showing the property crime rate falling 6.3% in 2015 to a record low.

The UCR violent crime rate (murder, rape, robbery, and aggravated assault) should be roughly consistent with the NCVS serious violent crime rate (sexual assault, robbery, and aggravated assault),1but the UCR violent crime rate increased 3.0% in 2015 as the NCVS serious violent crime rate fell 11.7%….

OK, hold on. Everyone agrees that property crime is down, but the FBI says the reported violent crime rate increased 3 percent while the NCVS survey data says it decreased 11.7 percent? What’s going on? The biggest components of the violent crime index are robbery and aggravated assault. Both the UCR and the NCVS agree closely about the robbery rate, so that means there must be some kind of discrepancy in the aggravated assault rate:

The 2015 UCR aggravated assault rate was up 3.8% from 2014….NCVS total aggravated assaults were down 25.2% in 2015, and NCVS aggravated assaults reported to police were down 20.7%.

Yikes! Long story short, Nevin shows that this divergence between UCR and NCVS has been increasing for the past decade. The culprit, apparently, is exactly the opposite of the frequent allegation that police departments understate serious crime in order to make themselves look better. “The fact that NCVS victims are reporting aggravated assaults far below UCR recorded aggravated assaults suggests that police have become far more expansive than crime victims are when it comes to defining aggravated assault, perhaps to protect against allegations that the police undercount serious violent crime.”

Most likely, then, there’s a longstanding issue of how aggravated assault is reported and categorized. Basically, police departments underreported it in the past and are now overreporting it. Aggravated assault probably decreased or held steady in 2015, which means the overall rate of violent crime was also either down or steady.

There was an increase in the murder rate last year, from 4.44 in 2014 to 4.88 in 2015 (per 100,000). This is a significant jump, and it was apparently fueled by an especially large jump in about a dozen big cities. This is cause for concern, especially since the murder rate usually correlates roughly with the overall violent crime rate. The divergence last year is unusual, and we don’t yet know what explains it. It might just be a random spike, or it could suggest something worse.

But while murder gets the headlines, it’s only one small component of the overall crime rate. Overall property crime was down last year and overall violent crime was probably down too. These are, by far, the crimes that actually affect most people. With the exception of a few pockets of increased homicide, America continues to get safer and safer.

1The NCVS numbers don’t include homicide because you obviously can’t survey murder victims. However, homicide is a tiny part of the overall violent crime rate, so that doesn’t account for the difference between UCR and NCVS figures.

Link to article:

2015: The Great Crime Wave That Wasn’t

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