Useful Twitter extensions for Firefox
I often share material on Twitter when I find something interesting. This is the primary purpose of Twitter for me: share and find interesting links. Right now, the process is…
A better online public platform for discussing scientific papers? A Reddit-based proposal
In a recent post, Steve Hsu writes: It's a shame that we don't have a better online platform (e.g., like Quora or StackOverflow) for discussing scientific papers. This would allow…
R: fastest way of finding out of all elements of a vector are identical?
There is a question on SO about this: http://stackoverflow.com/questions/4752275/test-for-equality-among-all-elements-of-a-single-vector But I was a bit more curious, so! #test data, large vectors v1 = rep(1234, 1e6) v2 = runif(1e6) #functions to…
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…
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