The Williams %R is similar to an unsmoothed Stochastic %K. The values range from
zero to 100, and are charted on an inverted scale, that is, with zero at the top
and 100 at the bottom. Values below 20 indicate an overbought condition and a sell
signal is generated when it crosses the 20 line. Values over 80 indicate an oversold
condition and a buy signal is generated when it crosses the 80 line.
The %R indicator was developed by Larry Williams.