Math::Business::BollingerBands - Technical Analysis: Bollinger Bands
use Math::Business::BollingerBands; my $bb = new Math::Business::BollingerBands; $bb->set_days(20); $bb->set_deviations(2); # alternatively/equivalently my $bb = new Math::Business::BollingerBands(20, 2); # or to just get the recommended model ... (20, 2); my $bb = Math::Business::BollingerBands->recommended; my @closing_values = qw( 3 4 4 5 6 5 6 5 5 5 5 6 6 6 6 7 7 7 8 8 8 8 ); # choose one: $bb->insert( @closing_values ); $bb->insert( $_ ) for @closing_values; my ($L,$M,$U) = $bb->query; if( defined $M ) { print "BB: $L < $M < $U.\n"; } else { print "BB: n/a.\n"; }
The Bollinger Bands were designed by John Bollinger in the 1980s.
The bands provide a high and low water mark for the closing price. Volatility determines the width of the bands.
Conventional wisdom dictates that when prices consistently touch the upper band they are "overbought" and when they continually touch the lower band they are "oversold."
When the prices "bounce" off the lower band and cross the middle line, it is thought to indicate a buy-signal. The same (but opposite) could be said about bouncing off the upper band and crossing the middle line on the way down.
Paul Miller <jettero@cpan.org>
<jettero@cpan.org>
I am using this software in my own projects... If you find bugs, please please please let me know. There is a mailing list with very light traffic that you might want to join: http://groups.google.com/group/stockmonkey/.
Copyright © 2013 Paul Miller
This is released under the Artistic License. See perlartistic.
perl(1), Math::Business::StockMonkey, Math::Business::StockMonkey::FAQ, Math::Business::StockMonkey::CookBook
http://en.wikipedia.org/wiki/Bollinger_Bands
http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:bollinger_bands
To install Math::Business::RSI, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Math::Business::RSI
CPAN shell
perl -MCPAN -e shell install Math::Business::RSI
For more information on module installation, please visit the detailed CPAN module installation guide.