Buy - Williams %R just enters oversold region
Sell - Williams %R just enters overbought region
Parameters available:
Period - period of Williams %R
Lower Limit - lower limit of Williams %R
Upper Limit - upper limit of Williams %R
t - the minimum number of periods Williams %R to be above(buy)/below(sell) lower(buy)/upper(sell) limit before crossing over
Rule type - please refer to 140 for details
Data type - please refer to 141 for details