Statistics::Basic::Correlation(3pm) | User Contributed Perl Documentation | Statistics::Basic::Correlation(3pm) |
Statistics::Basic::Correlation - find the correlation between two lists
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; }
This list of methods skips the methods inherited from Statistics::Basic::_TwoVectorBase (things like query(), insert(), and ginsert()).
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).
Paul Miller "<jettero@cpan.org>"
Copyright 2012 Paul Miller -- Licensed under the LGPL
perl(1), Statistics::Basic, Statistics::Basic::_TwoVectorBase, Statistics::Basic::Vector
2012-01-23 | perl v5.20.2 |