Fsdb::Filter::dbcolsregression(3)

NAME
dbcolsregression - compute linear regression between two columns

SYNOPSIS
    dbcolsregression  [-a] column1 column2

DESCRIPTION
Compute linear regression over "column1" and "column2". Outputs slope, intercept, and correlation coefficient.

OPTIONS

-a or --include-non-numeric
    Compute stats over all records (treat non-numeric records as zero rather than just ignoring them).

-f FORMAT or --format FORMAT
    Specify a printf(3)-style format for output statistics. Defaults to "%.5g".

This module also supports the standard fsdb options:

-d  Enable debugging output.

-i or --input InputSource
    Read from InputSource, typically a file name, or "-" for standard input, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

-o or --output OutputDestination
    Write to OutputDestination, typically a file name, or "-" for standard output, or (if in Perl) a IO::Handle, Fsdb::IO or Fsdb::BoundedQueue objects.

--autorun or --noautorun
    By default, programs process automatically, but Fsdb::Filter objects in Perl do not run until you invoke the run() method. The "--(no)autorun" option controls that behavior within Perl.

--help
    Show help.

--man
    Show full manual.

SAMPLE USAGE

  Input:
    #fsdb x     y
    160 126
    180 103
    200 82
    220 75
    240 82
    260 40
    280 20

  Command:
    cat DATA/xy.fsdb | dbcolsregression x y | dblistize

  Output:
    #fsdb -R C slope intercept confcoeff n
    slope:     -0.79286
    intercept: 249.86
    confcoeff: -0.95426
    n:         7

    #  | dbcolsregression x y
    #                confidence intervals assume normal distribution and small n.
    #  | dblistize

Sample data from <http://people.hofstra.edu/faculty/Stefan_Waner/RealWorld/calctopic1/regression.html> by Stefan Waner and Steven R. Costenoble.

SEE ALSO
dbcolstats, dbcolscorrelate, Fsdb.

CLASS FUNCTIONS

  new
    $filter = new Fsdb::Filter::dbcolsregression(@arguments);

Create a new dbcolsregression object, taking command-line arguments.

  set_defaults
    $filter->set_defaults();

Internal: set up defaults.

  parse_options
    $filter->parse_options(@ARGV);

Internal: parse command-line arguments.

  setup
    $filter->setup();

Internal: setup, parse headers.

  run
    $filter->run();

Internal: run over each rows.

AUTHOR and COPYRIGHT
Copyright (C) 1997-2018 by John Heidemann <johnh@isi.edu>

This program is distributed under terms of the GNU general public license, version 2. See the file COPYING with the distribution for details.