/ 
stockmonkey-2.9014
River stage zero No dependents
/ Math::Business::BollingerBands

NAME

Math::Business::BollingerBands - Technical Analysis: Bollinger Bands

SYNOPSIS

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";
}

RESEARCHER

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.

AUTHOR

Paul Miller <jettero@cpan.org>

I am using this software in my own projects... If you find bugs, please please please let me know.

I normally hang out on #perl on freenode, so you can try to get immediate gratification there if you like. irc://irc.freenode.net/perl

There is also a mailing list with very light traffic that you might want to join: http://groups.google.com/group/stockmonkey/.

COPYRIGHT

Copyright (c) 2010 Paul Miller

LICENSE

This module is free software. You can redistribute it and/or modify it under the terms of the Artistic License 2.0.

This program is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose.

[This software may have had previous licenses, of which the current maintainer is completely unaware. If this is so, it is possible the above license is incorrect or invalid.]

SEE ALSO

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