1Fsdb::Filter::dbcolscorUrseelratCeo(n3t)ributed Perl DocFusmdebn:t:aFtiilotner::dbcolscorrelate(3)
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NAME

6       dbcolscorrelate - find the coefficient of correlation over columns
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SYNOPSIS

9           dbcolscorrelate column1 column2 [column3...]
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DESCRIPTION

12       Compute the coefficient of correlation over two (or more) columns.
13
14       The output is one line of correlations.
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16       With exactly two columns, a new column correlation is created.
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18       With more than two columns, correlations are computed for each pairwise
19       combination of rows, and each output column is given a name which is
20       the concatenation of the two source rows, joined with an underscore.
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22       By default, we compute the population correlation coefficient (usually
23       designed rho, ρ) and assume we see all members of the population.  With
24       the --sample option we instead compute the sample correlation
25       coefficient, usually designated r.  (Be careful in that the default
26       here to full-population is the opposite of the default in dbcolstats.)
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28       This program requires a complete copy of the input data on disk.
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OPTIONS

31       --sample
32           Select a the Pearson product-moment correlation coefficient (the
33           "sample correlation coefficient", usually designated r).
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35       --nosample
36           Select a the Pearson product-moment correlation coefficient (the
37           "sample correlation coefficient", usually designated r).
38
39       -f FORMAT or --format FORMAT
40           Specify a printf(3)-style format for output statistics.  Defaults
41           to "%.5g".
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43       -T TmpDir
44           where to put tmp files.  Also uses environment variable TMPDIR, if
45           -T is not specified.  Default is /tmp.
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47       This module also supports the standard fsdb options:
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49       -d  Enable debugging output.
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51       -i or --input InputSource
52           Read from InputSource, typically a file name, or "-" for standard
53           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
54           objects.
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56       -o or --output OutputDestination
57           Write to OutputDestination, typically a file name, or "-" for
58           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
59           Fsdb::BoundedQueue objects.
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61       --autorun or --noautorun
62           By default, programs process automatically, but Fsdb::Filter
63           objects in Perl do not run until you invoke the run() method.  The
64           "--(no)autorun" option controls that behavior within Perl.
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66       --help
67           Show help.
68
69       --man
70           Show full manual.
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SAMPLE USAGE

73   Input:
74           #fsdb name id test1 test2
75           a 1 80 81
76           b 2 70 71
77           c 3 65 66
78           d 4 90 91
79           e 5 70 71
80           f 6 90 91
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82   Command:
83           cat DATA/more_grades.fsdb | dbcolscorrelate test1 test2
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85   Output:
86           #fsdb correlation
87           0.83329
88           #  | dbcolscorrelate test1 test2
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SEE ALSO

91       Fsdb, dbcolstatscores, dbcolsregression, dbrvstatdiff.
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CLASS FUNCTIONS

94   new
95           $filter = new Fsdb::Filter::dbcolscorrelate(@arguments);
96
97       Create a new dbcolscorrelate object, taking command-line arguments.
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99   set_defaults
100           $filter->set_defaults();
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102       Internal: set up defaults.
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104   parse_options
105           $filter->parse_options(@ARGV);
106
107       Internal: parse command-line arguments.
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109   setup
110           $filter->setup();
111
112       Internal: setup, parse headers.
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114   run
115           $filter->run();
116
117       Internal: run over each rows.
118

120       Copyright (C) 1998-2021 by John Heidemann <johnh@isi.edu>
121
122       This program is distributed under terms of the GNU general public
123       license, version 2.  See the file COPYING with the distribution for
124       details.
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128perl v5.34.0                      2021-07-22  Fsdb::Filter::dbcolscorrelate(3)
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