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 cognitive ability were strong ranging from .69 to .81 depending on which year, analysis and dataset is chosen. Method of correlated vectors supported the interpretation…

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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 extracted from datasets where all or nearly so the variables are correlated. At the case-level, such general factors are decreased in size if there are…

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Error handling in R is odd

So you want to run some code that may throw an error? This is somewhat less common with R than with e.g. php. It is quite simple in Python: The try statement works as follows. First, the try clause (the statement(s) between the try and except keywords) is executed. If no exception occurs, the except…

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Harvard SAT and IQ: How much regression towards the mean?

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 first I assumed he was wrong, but my recent analysis suggesting Harvard undergrads have an average Wechsler IQ of 122, really…

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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 (technical question) Abstract I explore a large (N≈1000), open dataset of brain measurements and find a general factor of brain size (GBSF) that covers all…

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