R: assign() inside nested functions
Recently, I wrote a function called copy_names(). It does what you think and a little more: it copies names from one object to another. But it can also attempt to…
Intelligence 34 (2006): Climate and general intelligence, mini special issue
This was an exchange between researchers that took place in 2006 in the academic journal Intelligence (34). Templer, D. I., & Arikawa, H. (2006). Temperature, skin color, per capita income,…
kirkegaard: conditional recoding with conditional_change()
Usually working with large public datasets requires that one recode variables. This can be quite repetitive. When variables only have a few possible values, one can use something like plyr's…
Ethnic heterogeneity and tail effects
Chisala has his 3rd installment up: http://www.unz.com/article/closing-the-black-white-iq-gap-debate-part-3/ One idea I had while reading it was that tail effects interact with population ethnic/racial heterogeneity. To show this, I did a simulation…
kirkegaard: GG_group_means(), easy plotting of group means using ggplot2
Do you find yourself in need of making nice ggplot2 plots for group means over and over again? Are you tired of (re-)writing big chunks of code for something that…
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,…
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…
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.…
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…
Occupations, cognitive ability and stereotypes
It 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…
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