Embryo selection and genetic correlated traits: A reanalysis
There seem to be ways to post knitr documents to Wordpress blogs, but until that's set up, I will be publishing them over at RPubs and posting a link here.…
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…
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…
Correcting for n-level discretization?
When one has a continuous variable and then cuts it into bins (discretization) and correlates it with some other variable, the observed correlation is biased downwards to some extent. The…
Causality, transitivity and correlation
Disclaimer: Some not too structured thoughts. It's commonly said that correlation does not imply causation. That is true (see Gwern's analysis), but does causation imply correlation? Specifically, if "→" means…
Stereotypes are relevant for judgments about individuals even when one has individualized information
Title says it all. Apparently, some think this is not the case, but it is a straightforward application of Bayes' theorem. When I first learned of Bayes' theorem years ago,…
Differential measurement error and regression
In reviewing our upcoming target article in Mankind Quarterly (edit: now published), Gerhard Meisenberg wrote: “One possibility that you don’t seem to discuss is that there are true and large…
Linguistics paper (for class): Typology and statistics
This may have some interest. Basically, typologists cannot into statistics and it shows. On the other hand, it means there is a large number of low hanging fruit for someone…