1DBCOLPERCENTILE(1)    User Contributed Perl Documentation   DBCOLPERCENTILE(1)
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NAME

6       dbcolpercentile - compute percentiles or ranks for an existing column
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SYNOPSIS

9           dbcolpercentile [-rplhS] column
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DESCRIPTION

12       Compute a percentile of a column of numbers.  The new column will be
13       called percentile or rank.  Non-numeric records are handled as in other
14       programs.
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16       If the data is pre-sorted and only a rank is requested, no extra
17       storage is required.  In all other cases, a full copy of data is
18       buffered on disk.
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OPTIONS

21       -p or --percentile
22           Show percentile (default).
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24       -P or --rank or --nopercentile
25           Compute ranks instead of percentiles.
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27       --fraction
28           Show fraction (percentage, except between 0 and 1, not cumulative
29           fraction).
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31       -a or --include-non-numeric
32           Compute stats over all records (treat non-numeric records as zero
33           rather than just ignoring them).
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35       -S or --pre-sorted
36           Assume data is already sorted.  With one -S, we check and confirm
37           this precondition.  When repeated, we skip the check.
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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       Sort specification options (can be interspersed with column names):
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49       -r or --descending
50           sort in reverse order (high to low)
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52       -R or --ascending
53           sort in normal order (low to high)
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55       -n or --numeric
56           sort numerically (default)
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58       -N or --lexical
59           sort lexicographically
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61       This module also supports the standard fsdb options:
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63       -d  Enable debugging output.
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65       -i or --input InputSource
66           Read from InputSource, typically a file name, or "-" for standard
67           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
68           objects.
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70       -o or --output OutputDestination
71           Write to OutputDestination, typically a file name, or "-" for
72           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
73           Fsdb::BoundedQueue objects.
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75       --autorun or --noautorun
76           By default, programs process automatically, but Fsdb::Filter
77           objects in Perl do not run until you invoke the run() method.  The
78           "--(no)autorun" option controls that behavior within Perl.
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80       --help
81           Show help.
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83       --man
84           Show full manual.
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SAMPLE USAGE

87   Input:
88           #fsdb name id test1
89           a 1 80
90           b 2 70
91           c 3 65
92           d 4 90
93           e 5 70
94           f 6 90
95
96   Command:
97           cat DATA/grades.fsdb | dbcolpercentile test1
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99   Output:
100               #fsdb name id test1 percentile
101               d       4       90      1
102               f       6       90      1
103               a       1       80      0.66667
104               b       2       70      0.5
105               e       5       70      0.5
106               c       3       65      0.16667
107               #  | dbsort -n test1
108               #   | dbcolpercentile test1
109
110   Command 2:
111           cat DATA/grades.fsdb | dbcolpercentile --rank test1
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113   Output 2:
114               #fsdb name id test1 rank
115               d       4       90      1
116               f       6       90      1
117               a       1       80      3
118               b       2       70      4
119               e       5       70      4
120               c       3       65      6
121               #  | dbsort -n test1
122               #   | dbcolpercentile --rank test1
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SEE ALSO

125       Fsdb.  dbcolhisto.
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128       Copyright (C) 1991-2018 by John Heidemann <johnh@isi.edu>
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130       This program is distributed under terms of the GNU general public
131       license, version 2.  See the file COPYING with the distribution for
132       details.
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136perl v5.28.1                      2019-02-02                DBCOLPERCENTILE(1)
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