XYY supermales and violence

Nature has a review of Robert Plomin’s new book by some random lefty historian data-free reasoning type called Nathaniel Comfort (he follows the usual pattern of having a background in biology, as the usual suspects). Among the usual claims without any supporting references we find this one: Crude hereditarianism often re-emerges after major advances in…

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Swedish immigrant crime data from the 1980s

I was skimming a Wikipedia article related to immigrant crime and came across an obscure Swedish language report from the 1990s: Ahlberg, J. (1996). Invandrares och invandrares barns brottslighet: En statistisk analys [Immigrants’ and immigrants’ children’s crime: a statistical analysis]. Brottsförebyggande rådet (BRÅ). (file available on OSF) This report is a goldmine. Briefly: Data from…

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Measurement error and behavioral genetics in criminology

I am watching Brian Boutwell’s (Twitter, RG) talk at a recent conference and this got me thinking. What are we measuring? As far as I know, there are typically two outcome variables used in criminological studies: Official records convictions. Self-reported criminal or anti-social behavior. But exactly what trait are we trying to measure? It seems…

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Crime/violence, gender, sexual orientation, cognitive ability

In a recent paper, Beaver et al looked at the relationships between crime, gender and sexual orientation: This study examined the association between sexual orientation and nonviolent and violent delinquency across the life course. We analyzed self-reported nonviolent and violent delinquency in a sample of heterosexual males (N=5220–7023) and females (N=5984–7875), bisexuals (N=34–73),gay males (N=145–189),…

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Intelligence, income inequality and prison rates: It’s complicated

There was some talk on Twitter around prison rates and inequality: I wonder why. "Rates of imprisonment are higher in unequal countries t.co/ibDN21PqZX" t.co/EJy9vSCMFL MT @ChartsandMaps — JayMan (@JayMan471) January 10, 2015 And IQ and inequality: Here @JayMan471 i plotted it for you. rank-order r is higher and more proper (data not normal). pic.twitter.com/QzHDwxeIC4 —…

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New paper out: Criminality among Norwegian immigrant populations

openpsych.net/ODP/2014/04/criminality-among-norwegian-immigrant-populations/ Abstract A previous study found that criminality among immigrant groups in Denmark was highly predictable by their countries of origin’s prevalence of Muslims, IQ, GDP and height. This study replicates the study for Norway with similar results. Keywords: Crime, national IQ, group differences, country of origin — Download paper. Forum thread and supplementary material.

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Paper published: Criminality and fertility among Danish immigrant populations

Abstract Criminality rates and fertility vary wildly among Danish immigrant populations by their country of origin. Correlational and regression analyses show that these are very predictable (R’s about .85 and .5) at the group level with national IQ, Islam belief, GDP and height as predictors. Published in our new journal for psychology. openpsych.net/index.php/diff/article/view/7 Peer review…

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