Error in the previous version of FA_residuals()
In the spirit of reproducible science, this is a post about an error I fixed in a function that affects all prior analyses with that. When factor analyzing data, the…
Cognitive dysgenics in the OKCupid dataset: a few simple analyses
OKCupid dataset (not public right now, contact me if you want the password). Draft paper: https://osf.io/p9ixw/ I looked at whether there was evidence for cognitive dysgenics in the OKCupid dataset.…
Change in Egyptian skull sizes: -4000 to 150
I often read statistics textbooks. In textbooks, they often use example datasets, some of which are interesting in themselves (e.g. the Boston dataset). In this case, I am reading An…
R functions for analyzing missing data
I'm reading Missing Data: A Gentle Introduction and it mentions various methods to understand how data are missing in a given dataset. The book, however, is light on actual tools.…
Estimation of piecewise linear functions
Suppose you have some dataset where you know or suspect that the real generating function is actually a piecewise function with k pieces each of which is a standard linear…
A more intuitive explanation of the correlation
Someone asks on Reddit: Can someone intuitively explain the correlation formula? I know what the Cov(X,Y) means. It tells you if the relationship between the variables X and Y is…
Scraping: temperature and precipitation data for all NOAA weather stations
Some people claim that the climate has direct causal influences on income, cognitive ability and so on. Usually, these academics just regress IQ on climate variables at the country or…
US state IQs cannot be estimated from OKCupid data
In the interest of publishing null findings: I tried estimating US state IQs from the mean cognitive ability for users in the OKCupid dataset. However, this did not work out.…
Data sharing and Add Health
I am doing an S factor study of US counties in the usual way. For that reason, I need some kind of county-level cognitive ability estimate. I know that this…
kirkegaard: Plot contingency table with ggplot2
This is a post in the on-going series about stuff in my package: kirkegaard [I'm not egocentric but since there is no central theme about the functions in the package…
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