

LogLikelihood measure is computed as 
LogLikelihood = 2 * [n111 * log(n111/m111) + n112 * log(n112/m112) + n121 * log(n121/m121) + n122 * log(n122/m122) + n211 * log(n211/m211) + n212 * log(n212/m212) + n221 * log(n221/m221) + n222 * log(n222/m222)] 
Total Mutual Information 
tmi = [n111/nppp * log(n111/m111) + n112/nppp * log(n112/m112) +
n121/nppp * log(n121/m121) + n122/nppp * log(n122/m122) + n211/nppp * log(n211/m211) + n212/nppp * log(n212/m212) + n221/nppp * log(n221/m221) + n222/nppp * log(n222/m222)] 
Pointwise Mutual Information  pmi = log (n111/m111) 
Poisson Stirling Measure  ps = n111 * ( log(n111/m111)  1) 
getValues($count_values)  This method calls computeMarginalTotals the computeObservedValues() and the computeExpectedValues() methods to compute the observed and expected values. It checks these values for any errors that might cause the Loglikelihood, TMI and PMI measures to fail. INPUT PARAMS : $count_values .. Reference of an hash containing
the count values computed by the
count.pl program.RETURN VALUES : 1/undef ..returns ’1’ to indicate success
and an undefined(NULL) value to indicate
failure.computePMI($n, $m)  Computes the pmi of a given observed and expected value pair. INPUT PARAMS : $n ..Observed value
$m ..Expected valueRETURN VALUES : lognm .. the log of the ratio of
observed value to expected
value.
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 ThomsonMcInnes, University of Minnesota Twin Cities
<bthomson@d.umn.edu>Saiyam Kohli, University of Minnesota Duluth
<kohli003@d.umn.edu>
Last updated: $Id: MI.pm,v 1.16 2011/12/23 22:25:05 btmcinnes Exp $
<http://groups.yahoo.com/group/ngram/>
Copyright (C) 20002011, Ted Pedersen, Satanjeev Banerjee, Amruta Purandare, Bridget ThomsonMcInnes and Saiyam KohliThis 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 021111307, 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.
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