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Relative Strength Index
A measure of the performance of a stock relative to its industry or the performance of an industry relative to the market as a whole. A stock (or industry) outperforming its industry (or market) for a given period of time has a relative strength index value above 1; this is seen as a bullish sign for that stock (or industry). On the other hand, a stock (or industry) underperforming its industry (or market) for a given period of time has a relative strength index value under 1; this is seen as a bearish sign.