Nisbett’s 2009 book on intelligence, Intelligence and how to get it, is a goldmine of stupid claims that one can quote-mine for introduction and discussion sections of papers. For instance, Nisbett tries to argue that brain size is not causal for intelligence! He writes: The correlation between cranial capacity and IQ is probably about .30-.40 […]

@bechhof Might as well ask a couple of knowledgable people: @rcafdm @KirkegaardEmil is there evidence the BW IQ gap has closed since 90s? — Elan (@HoustonEuler) March 4, 2017 There’s been some talk about whether the SIRE (self-identified race/ethnicity) gaps are closing and if so how much and when they did that. The matter is […]

Disclaimer: I only took a brief look. Doing the reading and writing this post took maybe 30 minutes. I may have missed something, but unlikely it would have a major effect on the conclusions. I so very much want to believe this! Expert criticism wanted. @KirkegaardEmil @turingcop @ProfSteveFuller @JamesPsychol — Chris Cooper (@chris_r_cooper) March […]

Doing some background reading on genomics topics such as: Cross-population predictive validity of genomic scores (polygenic scores). LD-decay. Causal variant tagging / distribution of causal variants / genetic architecture. Admixture mapping accuracy given LD decay. Implications of the above for research into genetic causes of group differences in polygenic traits. Implications of the above for […]

In many ways, my science — and my colleagues’ science — generally involves collecting evidence for obvious hypotheses that are mainly denied by leftist-leaning people (more precisely, egalitarian). Here’s a brief review. Stereotypes about major demographic groups are quite accurate Jussim of course already showed this, but since it’s still frequently denied, seems that we […]

In evolutionary biology, there is a hypothesis about sex ratios: Trivers-Williard hypothesis. It has been noted that males have higher dispersion in their fertility than females have, a finding that is also true in humans (one, two, three). If resources are related to fertility — which they are in many species and used to be […]

I don’t have time to do this project right now. However, since I gathered a bunch of relevant resources that I don’t want to have to re-find, I will write them down somewhere — here. My blog is my extended memory. Music genres are another fuzzy concept, like races. Lots of genres (and classification systems […]

Disclaimer: I did not read Rushton’s seminal book on the topic. I was only first recently able to obtain a complete electronic copy (i.e. not abridged version). I did in fact only skim this literature. I don’t have time to work on this, but I’d like others to do so, hence I put the labor […]

This post covers some stuff already covered by others, but more briefly. Two studies of interest: Riemann, R., Angleitner, A., & Strelau, J. (1997). Genetic and Environmental Influences on Personality: A Study of Twins Reared Together Using the Self- and Peer Report NEO-FFI Scales. Journal of Personality, 65(3), 449–475. Connelly, B. S., & Ones, […]