1Statistics::Basic::CorrUesleartiCoonn(t3r)ibuted Perl DoSctuamteinsttaitciso:n:Basic::Correlation(3)
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NAME

6       Statistics::Basic::Correlation - find the correlation between two lists
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SYNOPSIS

9       Invoke it this way:
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11           my $correlation = correlation( [1,2,3], [1,2,3] );
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13       Or this way:
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15           my $v1  = vector(1,2,3);
16           my $v2  = vector(1,2,3);
17           my $cor = corr($v1,$v2);
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19       And then either query the values or print them like so:
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21           print "The correlation between $v1 and $v2: $correlation\n";
22           my $cq = $cor->query;
23           my $c0 = 0+$correlation;
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25       Create a 20 point "moving" correlation like so:
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27           use Statistics::Basic qw(:all nofill);
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29           my $sth = $dbh->prepare("select col1,col2 from data where something");
30           my $len = 20;
31           my $cor = corr()->set_size($len);
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33           $sth->execute or die $dbh->errstr;
34           $sth->bind_columns( my ($lhs, $rhs) ) or die $dbh->errstr;
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36           my $count = $len;
37           while( $sth->fetch ) {
38               $cor->insert( $lhs, $rhs );
39               if( defined( my $c = $cor->query ) ) {
40                   print "Correlation: $c\n";
41               }
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43               # This would also work:
44               # print "Correlation: $cor\n" if $cor->query_filled;
45           }
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METHODS

48       This list of methods skips the methods inherited from
49       Statistics::Basic::_TwoVectorBase (things like query(), insert(), and
50       ginsert()).
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52       new()
53           Create a new Statistics::Basic::Correlation object.  This function
54           takes two arguments -- which can either be arrayrefs or
55           Statistics::Basic::Vector objects.  This function is called when
56           the correlation() shortcut-function is called.
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58       query_covariance()
59           Returns the Statistics::Basic::Covariance object used to calculate
60           the correlation.
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62       query_vector1()
63           Return the Statistics::Basic::Vector for the first vector.
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65       query_vector2()
66           Return the Statistics::Basic::Vector object for the second vector.
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68       query_mean1()
69           Returns the Statistics::Basic::Mean object for the first vector.
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71       query_mean2()
72           Returns the Statistics::Basic::Mean object for the second vector.
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OVERLOADS

75       This object is overloaded.  It tries to return an appropriate string
76       for the calculation or the value of the computation in numeric context.
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78       In boolean context, this object is always true (even when empty).
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AUTHOR

81       Paul Miller "<jettero@cpan.org>"
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84       Copyright 2009 Paul Miller -- Licensed under the LGPL
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SEE ALSO

87       perl(1), Statistics::Basic, Statistics::Basic::_TwoVectorBase,
88       Statistics::Basic::Vector
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92perl v5.12.3                      2009-06-28 Statistics::Basic::Correlation(3)
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