Monthly Archives: June 2013

A Multivariate Approach to the Method of Correlated Vectors?

(Unedited post.) A while back, I deduced that either shared environment produces Jensen Effects or that the race-genes-IQ debate should be over. And then I reasoned that since the debate is ongoing, shared environment probably produces Jensen Effects. To quote … Continue reading

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Strong Jensen Effects on Shared Environment for Achievement in Samuelsson et al., 2007

The world’s leading expert on the Method of Correlated Vectors, Jan te Nijenhuis, has argued that this method can be applied to all sorts of measures of cognitive ability, including achievement tests. As such, I decided to extend my recent … Continue reading

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Jensen Effects in the Texas Adoption Study as reported by Loehlin et al. (1994)

Continuing with my running commentary on Meng Hu’s Re-analysis of Jensen’s study of Capron and Duyme adoption data post, I looked at the correlation between g-loadings and sibling correlations in the Texas Adoption Study. Loehlin et al. (1994) reported father, … Continue reading

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Jensen Effects on Variance Components in Jacobs et al. 2001

Below are the Jensen Effects on the variance components based Jacobs et al. (2001). The authors didn’t report g-loadings, so I used those reported in Kan (2011) plus the g-loading for WISC-R mazes. I also standardized the components (h^2, s^2, … Continue reading

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Jensen Effects on Variance Components in La Buda et al. 1987

Following up with the previous analyses, I looked at the relationship between the variance components and g-loadings in La Buda et al. (1987), a study which was based on a sample from the Colorado Reading Project. This study provided variance … Continue reading

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Two more tests for a Jensen Effect on c^2

(Note: I think that this analysis is rubbish. Using Falconer’s formula to derive shared environmental estimates is problematic. Generally, ignore it.) I computed the Jensen Effect on the variance components based on two other studies mentioned in Jensen (1998) on … Continue reading

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Jensen Effect on c^2 in Rijsdijk et al.

I repeated the previous analysis using the Dutch Twin study data provided by Rijsdijk et al. I extracted g-loadings from the correlation matrices using: MATRIX DATA VARIABLES=ROWTYPE_ INF COM ARI SIM DS VOC CODE PC BLK PA OA Raven. BEGIN … Continue reading

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Brief Commentary on Hu (2013, June 6) and a New Analysis

Note: My discussion here is overly repetitious and needs some editing — but I am sure that you can make sense of it. In Re-analysis of Jensen’s study of Capron and Duyme adoption data, Meng Hu investigated Jensen’s and Nisbett’s … Continue reading

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A Selectionist Account of the Curious Italian-American IQ?

Mr. Dalliard writes: You could make an immigrant selection argument about Italy. It’s not only that in the period of high European immigration to America immigrants were probably IQ-selected. You should also consider the fact that lots of immigrants returned … Continue reading

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Shared Environment and Jensen Effects

It’s well established that many ethnic group differences exhibit what is called a Jensen Effects, or a correlation between g-loadings and the magnitude of the group differences. It’s also well established that a test’s g-loading indexes its heritability coefficient. There … Continue reading

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