Paul Miller > stockmonkey-2.9403 > Math::Business::BollingerBands

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

COPYRIGHT ^

Copyright © 2013 Paul Miller

LICENSE ^

This is released under the Artistic License. See perlartistic.

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

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