The information content values come from WordNet::Similarity. These values are taken from the sense-tagged SemCor corpus and computed using the method described by Resnik 1995 :

http://ijcai.org/Past%20Proceedings/IJCAI-95-VOL%201/pdf/059.pdf

You can see a bit about how we use information content in the source code documentation of WordNet::Similarity :

http://search.cpan.org/dist/WordNet-Similarity/lib/WordNet/Similarity/ICFinder.pm
http://search.cpan.org/dist/WordNet-Similarity/utils/semCorFreq.pl

WordNet::Similarity does allow you to use other corpora to compute information content too. 

http://search.cpan.org/dist/WordNet-Similarity/utils/rawtextFreq.pl

I hope this helps.

Good luck!
Ted



On Tue, Nov 13, 2012 at 10:39 AM, Nachiket Kamat <nachik8kamat@gmail.com> wrote:
Hello Ted,

To calculate IC(a) we 1st need to calculate p(a)=freq/N

Could you tell me from where does the program get value for freq? Is it corpus specific or does it pick this value from WordNet tool.

Regards

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