NAME
phi.pm Version 0.1
SYNOPSIS
Statistical library package to calculate the Phi Coefficient. This package should be used with statistic.pl and rank.pl.
DESCRIPTION
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.
PHI COEFFCIENT = ((n11 * n22) - (n21 * n22))^2/ (n1p * np1 * np2 * n2p)
AUTHORS
Ted Pedersen <tpederse@d.umn.edu>
Bridget Thomson McInnes <bthomson@d.umn.edu>
BUGS
This measure currently only defined for bigram data stored in 2x2 contingency table.
SEE ALSO
Mailing List: http://groups.yahoo.com/ngram
COPYRIGHT
Copyright 2000-2004 by Ted Pedersen
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.