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Text::NSP::Measures::2UseriContributedNPerlMDosures::2D::Fisher2::twotailed(3)

NAME
       Text::NSP::Measures::2D::Fisher2::twotailed - Perl module
       implementation of the two-sided
						    Fisher's exact test
       (Deprecated).

SYNOPSIS
       Basic Usage

	 use Text::NSP::Measures::2D::Fisher2::twotailed;

	 my $npp = 60; my $n1p = 20; my	$np1 = 20;  my $n11 = 10;

	 $twotailed_value = calculateStatistic(	n11=>$n11,
					     n1p=>$n1p,
					     np1=>$np1,
					     npp=>$npp);

	 if( ($errorCode = getErrorCode()))
	 {
	   print STDERR	$errorCode." - ".getErrorMessage();
	 }
	 else
	 {
	   print getStatisticName."value for bigram is ".$twotailed_value;
	 }

DESCRIPTION
       This module provides a naive implementation of the fishers twotailed
       exact tests. That is the	implementation does not	have any optimizations
       for performance.	This will compute the factorials and the
       hypergeometric measures using direct multiplications.

       This measure should be used if you need exact values without any
       rounding	errors,	and you	are not	worried	about the performance of the
       measure,	otherwise use the implementations under	the
       Text::NSP::Measures::2D::Fisher module. To use this implementation, you
       will have to specify the	entire module name. Usage:

       statistic.pl Text::NSP::Measures::Fisher2::twotailed dest.txt
       source.cnt

       Assume that the frequency count data associated with a bigram
       <word1><word2> is stored	in a 2x2 contingency table:

		 word2	 ~word2
	 word1	  n11	   n12 | n1p
	~word1	  n21	   n22 | n2p
		  --------------
		  np1	   np2	 npp

       where n11 is the	number of times	<word1><word2> occur together, and n12
       is the number of	times <word1> occurs with some word other than word2,
       and n1p is the number of	times in total that word1 occurs as the	first
       word in a bigram.

       The fishers exact tests are calculated by fixing	the marginal totals
       and computing the hypergeometric	probabilities for all the possible
       contingency tables,

       A twotailed fishers test	is calculated by adding	the probabilities of
       all the contingency tables with probabilities less than the probability
       of the observed table. The twotailed fishers test tells us how likely
       it would	be to observe an contingency table which is less probable than
       the current table.

   Methods
       calculateStatistic() - This method computes the right sided Fishers
       exact test.
	   INPUT PARAMS	 : $count_values       .. Reference of an array
	   containing
						  the count values computed by
	   the
						  count.pl program.

	   RETURN VALUES : $twotailed	       .. Twotailed Fisher value.

       getStatisticName()
	   Returns the name of this statistic

	   INPUT PARAMS	 : none

	   RETURN VALUES : $name      .. Name of the measure.

AUTHOR
       Ted Pedersen,		    University of Minnesota Duluth
				    <tpederse@d.umn.edu>

       Satanjeev Banerjee,	    Carnegie Mellon University
				    <satanjeev@cmu.edu>

       Amruta Purandare,	    University of Pittsburgh
				    <amruta@cs.pitt.edu>

       Bridget Thomson-McInnes,	    University of Minnesota Twin Cities
				    <bthompson@d.umn.edu>

       Saiyam Kohli,		    University of Minnesota Duluth
				    <kohli003@d.umn.edu>

HISTORY
       Last updated: $Id: twotailed.pm,v 1.10 2008/03/26 17:24:15 tpederse Exp
       $

BUGS
SEE ALSO
       <http://groups.yahoo.com/group/ngram/>

       <http://www.d.umn.edu/~tpederse/nsp.html>

COPYRIGHT
       Copyright (C) 2000-2006,	Ted Pedersen, Satanjeev	Banerjee, Amruta
       Purandare, Bridget Thomson-McInnes and Saiyam Kohli

       This program is free software; you can redistribute it and/or modify it
       under the terms of the GNU General Public License as published by the
       Free Software Foundation; either	version	2 of the License, or (at your
       option) any later version.

       This program is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A	PARTICULAR PURPOSE.  See the GNU
       General Public License for more details.

       You should have received	a copy of the GNU General Public License along
       with this program; if not, write	to

	   The Free Software Foundation, Inc.,
	   59 Temple Place - Suite 330,
	   Boston, MA  02111-1307, USA.

       Note: a copy of the GNU General Public License is available on the web
       at <http://www.gnu.org/licenses/gpl.txt>	and is included	in this
       distribution as GPL.txt.

perl v5.32.0			Text::NSP::Measures::2D::Fisher2::twotailed(3)

NAME | SYNOPSIS | DESCRIPTION | AUTHOR | HISTORY | BUGS | SEE ALSO | COPYRIGHT

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