An S factor among census tracts of Boston
Abstract A factor analysis was carried out on 6 socioeconomic variables for 506 census tracts of Boston. An S factor was found with positive loadings for median value of owner-occupied…
Why do persons from higher mean IQ populations do better even after selection?
Abstract It has been found that workers who hail from higher socioeconomic classes have higher earnings even in the same profession. An environmental cause was offered as an explanation of…
Presentation for my talk for LCI15
Posted here as a sneak peak for those not coming, and for easy access for myself.
The S factor in Brazilian states
Abstract Sizeable S factors were found across 3 different datasets (from years 1991, 2000 and 2010), which explained 56 to 71% of the variance. Correlations of extracted S factors with…
Finding mixed cases in exploratory factor analysis
Abstract Two methods are presented that allow for identification of mixed cases in the extraction of general factors. Simulated data is used to illustrate them. Introduction General factors can be…
Examining the S factor in Mexican states
Paper PDF Abstract Two datasets of socioeconomic data was obtained from different sources. Both were factor analyzed and revealed a general factor (S factor). These factors were highly correlated with each other (.79…
Harvard SAT and IQ: How much regression towards the mean?
http://pumpkinperson.com/2015/04/13/is-the-sat-an-iq-test/ Blog commenter Lion of the Judah-sphere has claimed that the SAT does not correlate as well with comprehensive IQ tests as said IQ tests correlate with one another. At…
How exactly does one properly remove the effect of one variable? Residuals, partial correlation, multiple regression, semi-partial?
I ran into trouble trying to remove the effects of one variable on other variables doing the writing my reanalysis of the Noble et al 2015 paper. It was not…
The general brain factor, working memory, parental income and education, and racial admixture
UNFINISHED ANALYSIS. POSTED HERE TO ESTABLISH PRIORITY. MORE TO FOLLOW! Updated 2015-12-04 Remains to be done: Admixture analysis (doing) Proofreading and editing Deciding how to control for age and scanner…
Transracial adoption study: Bruce et al (2009)
Introduction This is a post in the on-going series of comments on studies of international/transracial adoption. A global genetic/hereditarian model of cognitive differences and their socioeconomic effects implies that adoptees…
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