/ 
Fsdb-2.40
River stage zero No dependents
/ Fsdb::Filter::dbcolsregression

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 Lhttp://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) 1991-2008 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.