|Log-Likelihood measure is computed as Log-Likelihood = 2 * [n1111 * log ( n1111 / m1111 ) + n1112 * log ( n1112 / m1112 ) + n1121 * log ( n1121 / m1121 ) + n1122 * log ( n1122 / m1122 ) + n1211 * log ( n1211 / m1211 ) + n1212 * log ( n1212 / m1212 ) + n1221 * log ( n1221 / m1221 ) + n1222 * log ( n1222 / m1222 ) + n2111 * log ( n2111 / m2111 ) + n2112 * log ( n2112 / m2112 ) + n2121 * log ( n2121 / m2121 ) + n2122 * log ( n2122 / m2122 ) + n2211 * log ( n2211 / m2211 ) + n2212 * log ( n2212 / m2212 ) + n2221 * log ( n2221 / m2221 ) + n2222 * log ( n2222 / m2222 )];|
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 : $count_values .. Reference of an hash containing
the count values computed by the
RETURN VALUES : 1/undef ..returns 1 to indicate success
and an undefined(NULL) value to indicate
computePMI($n, $m) - Computes the pmi of a given observed and expected value pair. INPUT PARAMS : $n ..Observed value
$m ..Expected value
RETURN VALUES : lognm .. the log of the ratio of
observed value to expected
Ted Pedersen, University of Minnesota Duluth
Satanjeev Banerjee, Carnegie Mellon University
Amruta Purandare, University of Pittsburgh
Bridget Thomson-McInnes, University of Minnesota Twin Cities
Saiyam Kohli, University of Minnesota Duluth
Last updated: $Id: MI.pm,v 1.3 2011/12/23 22:25:05 btmcinnes Exp $
Copyright (C) 2000-2011, 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 v5.20.3||TEXT::NSP::MEASURES::4D::MI (3)||2011-12-23|