Recent outperformance of defensive sectors has been taken as a bearish sign by many market observers. Let's look back into history to learn if that conclusion is justified.The following snapshot shows the spreadsheet I use for tracking weekly performance of key sector ETFs (very important BTW, if you are a short term oriented trader). In the area on the right, I calculate relative strength of each sector based on a propriatary formula. Excel then offers a nice option to visualize results using a red-yellow-green system (BTW: I'm a very "visual person". Visuals help me to find patterns in all that data.) As you can see, defensive sectors Health Care, Utilities and Consumer Staples have been in fact the leading groups for the last two weeks after dramatically underperforming for the prior month.
I ran a little study to find out if leading defensive sectors in a strong market predict lower prices. I was looking for events, where these sectors showed at least 65% of realtive strength when the SPY was above the 50 day moving average. Unfortunately, my data just goes back until 1999, but results were not overly impressive:- a similar pattern occured 10 times during the last 10 years.
- 5 out of the 10 times, the SPY lost value four weeks after the observation (same for a 10 week period)
- Average gain after 4 weeks: +0.13%, standard deviation: 2.53%
- Average loss after 10 weeks: -0.4%, standard deviation: 4.55%
Conclusion:
you have to be careful with a conclusion because of the small number of observations. There seems to be a small bias to the downside after 10 weeks, but a hit rate of 50% seems like a coin flip. Also, a standard deviation of 4.55% is pretty high (Recall: that means 68% of the observations are located between -4.15% and +4.95%).
Also keep in mind that this a very simple quantitive study, which was just supposed to give me some
directional ideas. So just based on the defensive sector observation, I wouldn 't be too bearish at this point.




