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Manual Reference Pages  -  STATISTICS::BASIC::MEDIAN (3)

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NAME

Statistics::Basic::Median - find the median of a list

CONTENTS

SYNOPSIS

Invoke it this way:



    my $median = median(1,2,3);



Or this way:



    my $v1  = vector(1,2,3);
    my $med = median($v1);



And then either query the values or print them like so:



    print "The median of $v1: $med\n";
    my $mq = $med->query;
    my $m0 = 0+$med;



Create a 20 point moving median like so:



    use Statistics::Basic qw(:all nofill);

    my $sth = $dbh->prepare("select col1 from data where something");
    my $len = 20;
    my $med = median()->set_size($len);

    $sth->execute or die $dbh->errstr;
    $sth->bind_columns( my $val ) or die $dbh->errstr;

    while( $sth->fetch ) {
        $med->insert( $val );
        if( defined( $m = $med->query ) ) {
            print "Median: $m\n";
        }

        # This would also work:
        # print "Median: $med\n" if $med->query_filled;
    }



METHODS

<B>B>new()<B>B> The constructor takes a single array ref or a single Statistics::Basic::Vector as arguments. It returns a Statistics::Basic::Median object.

Note: normally you’d use the median() constructor, rather than building these by hand using new().

<B>B>_OVB::import()<B>B> This module also inherits all the overloads and methods from Statistics::Basic::_OneVectorBase.

OVERLOADS

This object is overloaded. It tries to return an appropriate string for the calculation or the value of the computation in numeric context.

In boolean context, this object is always true (even when empty).

AUTHOR

Paul Miller <jettero@cpan.org>

COPYRIGHT

Copyright 2012 Paul Miller — Licensed under the LGPL

SEE ALSO

perl(1), Statistics::Basic, Statistics::Basic::_OneVectorBase, Statistics::Basic::Vector
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perl v5.20.3 STATISTICS::BASIC::MEDIAN (3) 2012-01-23

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