The g factor and principal components regression
Jensen spent decades trying to convince people that the g factor (general intelligence) is the primary reason why IQ tests predict stuff, not whatever mental abilities the tests appear to…
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…
School factors are not important: evidence from classroom separation studies
People commonly ascribe large effects to having this or that teacher, or this or that classmate. They usually cite some anecdotes from their personal lives for this, but large sample…
The intelligence of stereotypes
The theory seems obvious: since stereotypes are just beliefs about groups, having more accurate stereotypes would be expected to be related to intelligence, just as having more accurate beliefs on…
A note on sex difference in variation in attractiveness
Given the recent discussion of sex differences in variation in traits, The Audacious Epigone has a quick post based on the GSS (you guessed it). He finds: The weight finding…
Replication crisis/decline effect in 1979
I was doing some work on my first name study preparing it for publication and was reading some old papers. McDavid, J. W., & Harari, H. (1966). Stereotyping of names…
Gladwell, the threshold effect for IQ, and Jensen
I don't think Malcolm Gladwell has been debunked hard enough, so here's my contribution towards that goal. For Steven Pinker's take, see here. Gladwell is essentially a story teller, and…
Danish national IQ
Best estimate of Danish-Scandinavian IQ based on recent, large samples is ~103 relative to UK norms. What is the Danish national IQ? If we look at Lynn and Vanhanen 2012,…
Country level indicators of altruism
A traditional approach to studying altruism has been to do some kind of economic game. E.g. seeing how nice people are in ultimatum games. One such study: Oosterbeek, H., Sloof,…
The original texts of the Eyferth study
Often discussed, occasionally cited, but rarely read -- certainly a highly suspicious combo -- I post here the original German language final version (we think): Eyferth, K. (1961). Leistungen verschiedener…
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