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Relative strength is an important and often misunderstood investment thesis. In 1998 UCLA professors Narisimhan Jegadeesh and Sheridan Titman did some tests utilizing price changes (relative strength) over several different time frames. They found a direct statistically significant correlation between relative strength and later price performance up to 12 months later. The most consistent period for defining the initial relative strength was six months. Relative strength and ranking are also the cornerstones of legendary investors/authors such as James O'Shaughnessy, Bill O'Neal, and Charles Kirkpatrick, CMT
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