Rnotebook: http://rpubs.com/EmilOWK/immigrant_IQ_Danish_draft Because I was discussing this dataset with a friend, I decided to reexamine it. Examining this dataset was my first reviewed paper (Kirkegaard 2013). It was manually done in Excel with no statistical guidance. So I had to work out everything myself based on googling around for formulas. My first write-up was not very good, but the reviewers at Mankind Quarterly were very friendly and helpful, and eventually I managed to produce a write-up that's half-way sensible.