Transracial adoption meta-analysis: Van Ijzendoorn et al (2005)

Van Ijzendoorn, M. H., Juffer, F., & Poelhuis, C. W. K. (2005). Adoption and cognitive development: a meta-analytic comparison of adopted and nonadopted children’s IQ and school performance. Psychological bulletin, 131(2), 301. It turns out that someone already did a meta-analysis of adoption studies and cognitive ability. It does not solely include cross-country transracial, but…

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kirkegaard: df_func()

Often I want to get the mean value for a case across a number of columns, usually years. This however gets repetitive because the base mean() function cannot handle data like that. Other times, one wants to standardize the data first, e.g. when the scales are not the same across variables. Lastly, often one wants…

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Transracial adoption study: Odenstad et al (2008)

I found this one a long time ago and tweeted it, but apparently forgot to blog it. Odenstad, A., Hjern, A., Lindblad, F., Rasmussen, F., Vinnerljung, B., & Dalen, M. (2008). Does age at adoption and geographic origin matter? A national cohort study of cognitive test performance in adult inter-country adoptees. Psychological Medicine, 38(12), 1803-1814….

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kirkegaard: df_add_delta()

One idea for a series of blog posts is that I could about new functions in my R package. Often I just push these without letting anyone know, but I guess it could be useful to make an introduction for them (the more interesting ones anyway) here. Function description: Adds delta (difference) columns to a…

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Another political bias test

See also: Rationality and bias test results I stumbled upon another political bias test: http://econturingtest.com/ Basically, you will be given 10 questions: 5 about why US-style conservatives favor/oppose a given policy, and 5 why US-style liberals favor/oppose, the same policy. It is a multiple-choice format. Your score is then calculated simply after comparison with the…

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Genomic autocorrelation of quantitative traits

The genetic clustering of Europeans. https://t.co/lGw9dX0sbD Does anyone know of a larger FST table? @razibkhan pic.twitter.com/1vjxeO2F7d — Emil O W Kirkegaard (@KirkegaardEmil) November 7, 2015 See first: Some methods for measuring and correcting for spatial autocorrelation Piffer’s method Piffer’s method to examine the between group heritability of cognitive ability and height uses polygenic scores (either…

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Review: Quantitative Research in Linguistics: An Introduction

https://www.goodreads.com/book/show/19823567-quantitative-research-in-linguistics http://gen.lib.rus.ec/book/index.php?md5=3bb68f8bfea90338ad2efa04569108e2 There are few good things to say about this book. The best thing is on the very first page: Some things never change: the sun rises in the morning. The sun sets in the evening. A lot of linguists don’t like statistics. I have spent a decade teaching English language and linguistics at…

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