Buy - Williams %R is trending upwards
Sell - Williams %R is trending downwards
Parameters available:
Period - period of Williams %R
t - the number of periods that Williams %R has been trending
Slope - the minimum slope of the moving average of Williams %R when it is trending
MA period - the number of periods used for the period of the moving average of Williams %R
Rule type - please refer to 140 for details
Data type - please refer to 141 for details