Transracial adoption study: Lindblad et al, 2003
As Jason Malloy has mentioned, it is strange that in the race intelligence debates, people usually cite the same few studies over and over: Shortly after writing that post, I…
Spearman’s hypothesis on item-level data from Raven’s Standard Progressive Matrices: A replication and extension
Emil O. W. Kirkegaard1 Abstract Item-level data from Raven’s Standard Progressive Matrices was compiled for 12 diverse groups from previously published studies. Jensen’s method (method of correlated vectors) was used…
International differences in intelligence can be confusing: A commentary on Harrison et al (2015)
Abstract In this commentary I explain how mean differences between normal distributions give rise to different percentages of the populations being above or below a given threshold, depending on where…
Opinions about nuclear energy and global warming, and wordsum intelligence
Abstract Using data from the ANES 2012 survey, I investigate the relationship between wordsum IQ estimates (unweighted sums, factor analytic and item-response theory scores) and opinions about nuclear energy and…
Attitude towards nuclear energy and correlates: educational attainment, gender, age, self-rated knowledge, experience, etc.
Nuclear energy often gets bad press. However, journalists are mostly very leftist, scientifically ill-educated women, so perhaps they are not quite the right demographic to tell us about this issue.…
Measuring scientific knowledge: can we use questions that are denied by the religious?
In reply to http://www.ljzigerell.com/?p=534 and his working paper here: http://www.ljzigerell.com/?p=2376 We are discussing his working paper over email, and I had some reservations about his factor analysis. I decided to…
Personality correlates of breadth vs. depth of research scholarship
Also posted on the Project Polymath blog. An interesting study has been published: Thomas S. Bateman, and Andrew M. Hess. Different personal propensities among scientists relate to deeper vs. broader…
S and G in Italian regions: Re-analysis of Lynn’s data and new data
Abstract The S factor in 21 Italian regions was examined by reanalyzing data published by Lynn (Lynn, 2010) as well as new data compiled from the Italian statistics agency (7…
Examining the S factor in US states
Abstract A dataset of 25 diverse socioeconomic indicators for US states was compiled and subjected to factor analysis. Results showed that Washington DC was a strong outlier, but if it…
The S factor in China
Study PDF. Abstract I analyze the S factor in Chinese province-level units using data obtained from Lynn and Cheng (2013) as well as new data obtained from the Chinese statistical…
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