by Ryan Streeter on April 21, 2016. Follow Ryan on Twitter.
In his latest installment on the “bubble quiz,” Charles Murray shows again that people who are disconnected from the mainstream congregate around each other in a significant way.
He writes of the graph below:
The correlation between the bubble score and the combined [Socio-Economic Score] index is .43. For the social sciences, that’s high. For example, the correlation between educational attainment and income is usually around .4. The strongest single predictor of job productivity is an IQ score, and that correlation averages about .4 across studies. If someone took the effort to refine the items on the Bubble Quiz, and added a dozen additional questions, it should be possible to jack up the correlation with the combined SES index to around .5, the average correlation of a child’s IQ with the midpoint of parental IQ.