Using the more appropriate Gamma statistic, I recalculated the relationships displayed in the last post between IQ and 15 types of delinquency. Gamma is similar to Pearson--it ranges from -1.00 to +1.00.
Gamma measure of association
Lied to parents .08
Serious fight -.14
Seriously injured someone -.10
Ran away from home -.07
Stole a car -.01
Stole something > $50 -.01
Burglarized a building -.04
Used or threatened with weapon -.10
Sold drugs .10
Stole something < $50 .08
Group fight -.16
Rowdy in public .08
The associations are perhaps a bit sharper, but the only consistent negative relationship is between IQ and types of violence. The link is weak, however.
In this new study in the journal Intelligence, the authors find that low-IQ U.S. counties have higher crime rates. Macrolevel studies evidently show stronger correlations than microlevel studies. Maybe this is due to reduced measurement error. Also--official statistics capture much more serious behavior. Self-report data is swamped with minor misbehaviors, which smart kids are frequently guilty of. Keep in mind, too, that my analysis is of whites only. Including all races might strengthen the correlations.
I showed recently that Americans overwhelming select someone of the same race for a best friend. Friendship is a good measure of how well ...
In the comments in the last post , some readers contended that Jews are not ethnocentric. Using the same question I used in the comments se...
Which factor reduces family size the most? Below are the standardized OLS regression coefficients for a sample of whites ages 40-59: Stand...
Via a reader at iSteve, it looks like this might be the vocabulary test used by the General Social Survey. (Someone please tell me if I'...