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Williams %R

The Williams %R oscillator is very similar to the stochastic, but while the latter uses the difference between close and lowest of lows, Williams %R is based on the difference between close and highest of highs and oscillates between 0 and -100, with an inverted scale compared to normal oscillators. The overbought threshold is set at -20, while the oversold one is at -80.

The stochastic scale from 100 to 0 next to the Williams %R scale from 0 to minus 100, with the same overbought and oversold zones: minus 20 and minus 80.
Williams %R is the stochastic reading on an inverted scale: overbought above minus 20, oversold below minus 80.