NAME¶
Statistics::Basic::Correlation - find the correlation between two lists
SYNOPSIS¶
Invoke it this way:
my $correlation = correlation( [1,2,3], [1,2,3] );
Or this way:
my $v1 = vector(1,2,3);
my $v2 = vector(1,2,3);
my $cor = corr($v1,$v2);
And then either query the values or print them like so:
print "The correlation between $v1 and $v2: $correlation\n";
my $cq = $cor->query;
my $c0 = 0+$correlation;
Create a 20 point "moving" correlation like so:
use Statistics::Basic qw(:all nofill);
my $sth = $dbh->prepare("select col1,col2 from data where something");
my $len = 20;
my $cor = corr()->set_size($len);
$sth->execute or die $dbh->errstr;
$sth->bind_columns( my ($lhs, $rhs) ) or die $dbh->errstr;
my $count = $len;
while( $sth->fetch ) {
$cor->insert( $lhs, $rhs );
if( defined( my $c = $cor->query ) ) {
print "Correlation: $c\n";
}
# This would also work:
# print "Correlation: $cor\n" if $cor->query_filled;
}
METHODS¶
This list of methods skips the methods inherited from
Statistics::Basic::_TwoVectorBase (things like
query(),
insert(), and
ginsert()).
- new()
- Create a new Statistics::Basic::Correlation object. This function takes
two arguments -- which can either be arrayrefs or
Statistics::Basic::Vector objects. This function is called when the
correlation() shortcut-function is called.
- query_covariance()
- Returns the Statistics::Basic::Covariance object used to calculate the
correlation.
- query_vector1()
- Return the Statistics::Basic::Vector for the first vector.
- query_vector2()
- Return the Statistics::Basic::Vector object for the second vector.
- query_mean1()
- Returns the Statistics::Basic::Mean object for the first vector.
- query_mean2()
- Returns the Statistics::Basic::Mean object for the second vector.
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::_TwoVectorBase,
Statistics::Basic::Vector