Bollinger Bands are similar to moving average envelopes. The difference between Bollinger Bands and envelopes is envelopes are plotted at a fixed percentage above and below a moving average, whereas Bollinger Bands are plotted at standard deviation levels above and below a moving average.
The standard Bolling Bands (BOL 20-2) can be called like that : Finance::GeniusTrader::Indicators::BOL->new()
If you need a non standard BOL : Finance::GeniusTrader::Indicators::BOL->new([25, 2.5])
To install Finance::GeniusTrader, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Finance::GeniusTrader
CPAN shell
perl -MCPAN -e shell install Finance::GeniusTrader
For more information on module installation, please visit the detailed CPAN module installation guide.