G Jay Kerns has published a 400+ page introductory text on Probability and Statistics. All of the examples and illustrations are done using R (as Jay puts it, "The people at the party are Probability and Statistics; the handshake is R") so if you want to brush up on your probability and learn R at the same time, this might be a good resource. It would also be great for teaching: Jay wrote the book based on an undergraduate course he gave at Youngstown State University. There's also a plug-in for R Commander to access some of the methods via dialogs.

Jay's book is free, in both senses of the word. You can download the PDF for free from Lulu, or purchase a printed copy for just over $30. Jay has also published all of the LaTeX sources if you want to build the book yourself. And if you're already using R, you can read the book with just three commands:

install.packages("IPSUR")
library(IPSUR)
read(IPSUR)

original post on R-evolution Analytics

The nature/nurture debate that posits a competition between biological and social/cultural influences on human behavior  is alive and well in the mass media.  But scholars largely agree that culture and biology interact; biological realities shape our social world, but our social world also shapes our biologies.

One strain of research demonstrating this has shown that men’s testosterone levels (associated with feelings of well-being) rise and drop in response to social (and socially constructed) cues.  For example, the testosterone levels of the winner of a tennis match will rise after his win, while his opponent will see his levels go down.  Similarly, measuring men’s testosterone levels won’t tell you which men walking down the sidewalk will enter a strip club, but the men leaving the strip club will have higher testosterone levels than the men who passed it by.

Matt C. alerted me to a test of this phenomenon using the Presidential election.  There was a slight drop in testosterone levels for men who voted for Obama (normal because men’s testosterone levels tend to drop at night), but a dramatic drop for men who voted for McCain or the Libertarian candidate, Barr.

So, there you have it, biological responses to social cues.

Another (strange) effect recently ascribed to testosterone is the financial crisis; see: Il mondo potrebbe essere migliore