The Relative Strength Index (RSI) is a momentum oscillator that measures the speed and change of price moves. The RSI moves between zero and 100 and is considered overbought with a reading above 70 and oversold when below 30. Note the RSI can sustain an overbought (oversold) reading in a strong up (down) trend.
http://www.businessinsider.com/overbought-and-oversold-markets--february-15-2013-2
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