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…
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…
Correlations and likert scales: What is the bias?
A person on ResearchGate asked the following question: How can I correlate ordinal variables (attitude Likert scale) with continuous ratio data (years of experience)? Currently, I am working on my…
Some IQ studys
I red these today and needed an easy way to share them. Enjoy. Christopher Eppig, Corey L. Fincher and Randy Thornhill - Parasite prevalence and the worldwide distribution of cognitive…