One of the most difficult and interesting problems in scrutinizing anomalies arises when looking at calendar effects or seasonality. This is because numerous factors–both structural such as fund flow schedules or taxation, and behavioral such as the fear of a crash or holding overnight come into play. The October issue of “Expiring Monthly” that is written by Bill Luby of Vix and More, and Jared Woodward of Condor Options and many other prominent options gurus features an excellent article on “Fear and Loathing in October.” http://vixandmore.blogspot.com/2010/10/expiring-monthly-october-2010-issue.html This article is a great example of the multi-dimensional thinking that goes into explaining certain anomalies such as the prevalence of crashes in October. The entire issue is also very high quality and worth reading. CSS was featured in the article along with many other well known bloggers giving our own take on why this effect seems to occur. In light of this article, we will present a post this week on some interesting monthly anomalies that seem to contain a consistent effect.