Williams %RIn technical analysis, this is a momentum indicator measuring overbought and oversold levels, similar to a stochastic oscillator. It was developed by Larry Williams and compares a stock's close to the high-low range over a certain period of time, usually 14 days.
It is used to determine market entry and exit points. The Williams %R produces values from 0 to -100, a reading over 80 usually indicates a stock is oversold, while readings below 20 suggests a stock is overbought.
As with all overbought/oversold indicators, it is best to wait for the security's price to change direction before making any trades. It is not unusual for overbought/oversold indicators to remain in that condition for a long time as the security's price continues to climb/fall. Selling on the first indication of an overbought signal may reduce yields as it could be some time before the price shows signs of deterioration.
An interesting phenomena of the Williams %R indicator is its ability to anticipate a reversal in the underlying security's price. The indicator almost always forms a peak and turns down a few days before the security's price follows suit. Likewise, Williams %R usually creates a trough and turns up a few days before the security's price turns up.
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