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…
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,…
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…
Ancestry effects in Brazil: economist approach with person names
I have written a lot about ancestry approaches, generally from a psychometric and genomic angle. However, economists can also play this game. Daniel A. F. Lopes, Geraldo A. Silva Filho,…
Why is Eric Turkheimer so unreasonable about race and intelligence?
Eric Turkheimer is by many counts a good scientist. He has about 11.6k citations on Google Scholar, 6.3 since 2013 (i.e. last 5 years). He is prominent enough that he…
Nobel prize winners are very unlikely to be religious
This page on Wikipedia claims rather surprisingly that: This list comprises laureates of the Nobel Prize who self-identified as atheist, agnostic, freethinker or otherwise nonreligious at some point in their…
The non-contributions of Robert Sternberg to ISIR
This year (2018) Robert Sternberg is slated to give a distinguished contributor interview at the ISIR meeting to be held in Edinburgh. There's already tons of material on his behavior:…
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