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"There is plenty of evidence among academia that supports the potential value of relative strength, also called momentum, as an investment factor. This research has shown that, over multiple decades, relative strength strategies have consistently outperformed the overall market during bull and bear market cycles."


Research by Kenneth French, Ph.D. (of Fama & French fame) confirms that market strength is persistent. If one is willing to weed out weakness from a portfolio and rotate into relatively stronger performing stocks, portfolio performance improves significantly above the long-term average normally derived from Ibbotson data.


Momentum or Relative Strength, is a mathematical calculation allowing an investor to segregate portfolio holdings into tiers. Once identified, it is easier to make an objective decision to eliminate positions that are a drag on the portfolio.


After conducting a simple study, CXO Advisory concludes: "In summary, simple sector ETF momentum strategies have generally outperformed the broad stock market over the past decade for reasonably low trading frictions...Including ETFs representing other asset classes (such as bonds, commodities, equity styles and international stocks) may enhance results."


As Dr. French (above) has written, the success of momentum strategies is hard to explain away. It has been an area of interest in the academic and finance communities for more than twenty years. At the very least, relative strength systems can provide natural stops for equity traders and additionally inform them as to which classes, sectors, styles and countries are running hot or cold in the current market environment. At their best, they can make for powerful trading systems in their own right.

Relative strength is not magic, it's math!

“…the key to good performance is the ability to identify those stocks that are detracting from the performance of the portfolio. Most portfolio managers spend most of their time and effort trying to find the next big winner in the stock market but good portfolio performance depends more on finding and eliminating the bad stocks from the portfolio.” 


Invest in markets, asset classes or sectors with positive trends. Avoid or sell markets or sectors with negative trends. This creates the possibility of preserving capital in declining markets or participating in rising markets/sectors. 

Math - Not Magic!