While we cannot forecast returns to stocks on an individual basis, using quantitative investment analysis we can do a better job of forecasting returns to groups of stocks. One such momentum strategy says that if we take a stock universe (say S&P500 stocks) and rank the stocks in it into deciles based on past returns, then in a medium-term period of as long as a year, the top decile of the universe (winners) continues to outperform the bottom decile (losers)
Jegadeesh and Titman (1993) (JT) examined a variety of momentum strategies and documented that strategies that buy stocks with high returns over the previous 3 to 12 months and sell stocks with poor returns over the same time period earn profits of about 12% per year.
We can extrapolate this to an investment universe that contains the 10 sectors making up the U.S. stock market. So, I examined the ten sector ETFs representing the entire U.S. stock market provided by iShares finding that momentum works extremely well among industry and sector portfolios. This has also been verified by Moskowitz, and Grinblatt, in "Do Industries Explain Momentum?" Journal of Finance, (1999).
The trading strategy I am suggesting here is that you pick equity sectors with highest momentum (past performance) to go long while selling short the sectors with worst performing sectors. The goal of this strategy is to outperform a simple buy and hold of the U.S. equity market index. Behavioral biases such as investor over and under reaction and confirmation bias help account for this market anomaly which has been well tested.
With the analysis run as of market close on April 23, 2013, the following is the ranking of outperformance of the ten sectors.
|ETF Ticker||ETF Name||% Outperformance|
|IYM||iShares Dow Jones U.S. Basic Materials Sector Index Fund||-2.617876772|
|IYW||iShares Dow Jones U.S. Technology Sector Index Fund||-2.160881082|
|IYE||iShares Dow Jones U.S. Energy Sector Index Fund||2.495247148|
|IYZ||iShares Dow Jones U.S. Telecommunications Sector Index Fund||5.782450465|
|IDU||iShares Dow Jones U.S. Utilities Sector Index Fund||10.84178052|
|IYJ||iShares Dow Jones U.S. Industrial Sector Index Fund||11.3466158|
|IYF||iShares Dow Jones U.S. Financial Sector Index Fund||12.51877817|
|IYC||iShares Dow Jones U.S. Consumer Services Sector Index Fund||14.34701925|
|IYK||iShares Dow Jones U.S. Consumer Goods Sector Index Fund||16.00750771|
|IYH||iShares Dow Jones U.S. Healthcare Sector Index Fund||18.09322531|
A visual verification of the relative outperformance over the last 6 months is shown here: