Williams %R indicator is an oscillator of technical analysis, for which it works better in lateral trending markets that in those with a strong trend. Basically what it does is measure how close to the maximum or minimum of a certain period of time the prices have closed during the last trading session or during any other time frame chosen by the trader. Remember that like other indicators, it can be used to analyze different periods of time from few minutes to hours, days, weeks, etc.. It was developed by Larry Williams.
To apply this indicator the trader must select the time period, which is usually 14 periods (but that depends of the trader´s needs). In this case 14 is one of the most common value of this parameter but it be changed if the trader believes that he will have better results with other values. If the trader is analyzing the market development over a period of 1 or more days, the Williams% R indicates if the closing price of the last session is close or not of the maximum or the minimum of the last 14 sessions.
The idea is that when asset prices are analyzed in a market that is moving in a sideways trend (a trend with no clear direction), the fact that during the last session the closing price is near the maximum or minimum of the last 14 days may be an indication that is approaching the moment when the market could change its direction and go up or down. In short, if the market is in a sideways trend and the closing price of the last session is near the maximum of the last 14 sessions, probably the price will fall and if the closing price is near the minimum, there is a high probability that the price is going to rise.
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