1Fsdb::Filter::dbcolpercUesnetrilCeo(n3t)ributed Perl DocFusmdebn:t:aFtiilotner::dbcolpercentile(3)
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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.
15
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 or --mode percentile
22           Show percentile (default).  Percentile is the percentage of the
23           cumulative values at or lower than the current value, relative to
24           the total count.
25
26       -P or --rank or --nopercentile or --mode rank
27           Compute ranks instead of percentiles.
28
29       --fraction
30           Show fraction (percentage, except between 0 and 1, not cumulative
31           fraction).
32
33       -a or --include-non-numeric
34           Compute stats over all records (treat non-numeric records as zero
35           rather than just ignoring them).
36
37       -S or --pre-sorted
38           Assume data is already sorted.  With one -S, we check and confirm
39           this precondition.  When repeated, we skip the check.
40
41       -f FORMAT or --format FORMAT
42           Specify a printf(3)-style format for output statistics.  Defaults
43           to "%.5g".
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45       -T TmpDir
46           where to put tmp files.  Also uses environment variable TMPDIR, if
47           -T is not specified.  Default is /tmp.
48
49       Sort specification options (can be interspersed with column names):
50
51       -r or --descending
52           sort in reverse order (high to low)
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54       -R or --ascending
55           sort in normal order (low to high)
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57       -n or --numeric
58           sort numerically (default)
59
60       -N or --lexical
61           sort lexicographically
62
63       This module also supports the standard fsdb options:
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65       -d  Enable debugging output.
66
67       -i or --input InputSource
68           Read from InputSource, typically a file name, or "-" for standard
69           input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue
70           objects.
71
72       -o or --output OutputDestination
73           Write to OutputDestination, typically a file name, or "-" for
74           standard output, or (if in Perl) a IO::Handle, Fsdb::IO or
75           Fsdb::BoundedQueue objects.
76
77       --autorun or --noautorun
78           By default, programs process automatically, but Fsdb::Filter
79           objects in Perl do not run until you invoke the run() method.  The
80           "--(no)autorun" option controls that behavior within Perl.
81
82       --help
83           Show help.
84
85       --man
86           Show full manual.
87

SAMPLE USAGE

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

127       Fsdb.  dbcolhisto.
128

CLASS FUNCTIONS

130   new
131           $filter = new Fsdb::Filter::dbcolpercentile(@arguments);
132
133       Create a new dbcolpercentile object, taking command-line arguments.
134
135   set_defaults
136           $filter->set_defaults();
137
138       Internal: set up defaults.
139
140   parse_options
141           $filter->parse_options(@ARGV);
142
143       Internal: parse command-line arguments.
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145   setup
146           $filter->setup();
147
148       Internal: setup, parse headers.
149
150   _count_rows
151           $n = $self->_count_rows()
152
153       Interpose a filter on "$self-"{_in}> that counts the rows.
154
155   run
156           $filter->run();
157
158       Internal: run over each rows.
159

161       Copyright (C) 1991-2018 by John Heidemann <johnh@isi.edu>
162
163       This program is distributed under terms of the GNU general public
164       license, version 2.  See the file COPYING with the distribution for
165       details.
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169perl v5.32.0                      2020-11-16  Fsdb::Filter::dbcolpercentile(3)
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