Emil O. W. Kirkegaard blog
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…
Continue ReadingOften 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…
Continue ReadingI 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….
Continue ReadingOne 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…
Continue ReadingIt seems that no one has integrated this literature yet. I will take a quick stab at it here. It could be expanded into a proper paper later in case someone wants to and have time to do that. Stereotypes Lee Jussim (also blog) has done a tremendous job at reviewing the stereotype literature in…
Continue ReadingSee 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…
Continue ReadingOpenness to Experience – That Liberal Je Ne Sais Quoi Tattoos and piercing. I haven’t found any evidence that this relates to intelligence or even creativity. On the other hand, what underlying factor of openness would it be an indication of? I have. A long time ago, I tried to find a study of this. The…
Continue ReadingThe 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…
Continue Readinghttps://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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