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Text::NSP::Measures::3D::MI::ps 1.03

  Date Added: August 21, 2010  |  Visits: 615

Text::NSP::Measures::3D::MI::ps

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Text::NSP::Measures::3D::MI::ps is a Perl module that implements Poisson Stirling Measure for trigrams. SYNOPSIS Basic Usage use Text::NSP::Measures::3D::MI::ps; $ps_value = calculateStatistic( n111=>10, n1pp=>40, np1p=>45, npp1=>42, n11p=>20, n1p1=>23, np11=>21, nppp=>100); if( ($errorCode = getErrorCode())) { print STDERR $erroCode." - ".getErrorMessage()."n"; } else { print getStatisticName."value for bigram is ".$ps_value."n"; } The log-likelihood ratio measures the devitation between the observed data and what would be expected if < word1 >, < word2 > and < word3 > were independent. The higher the score, the less evidence there is in favor of concluding that the words are independent. The expected values for the internal cells are calculated by taking the product of their associated marginals and dividing by the sample size, for example: n1pp * np1p * npp1 m111= -------------------- nppp The poisson stirling measure is a negative lograthimic approximation of the poisson-likelihood measure. It uses the stirlings firmula to approximate the factorial in poisson-likelihood measure. It is computed as follows: Posson-Stirling = n111 * ( log(n111) - log(m111) - 1) Methods calculateStatistic() - This method calculates the ps value INPUT PARAMS : $count_values .. Reference of an hash containing the count values computed by the count.pl program. RETURN VALUES : $poissonStirling .. Poisson-Stirling value for this trigram. getStatisticName() - Returns the name of this statistic INPUT PARAMS : none RETURN VALUES : $name .. Name of the measure..

Requirements: No special requirements
Platforms: Linux
Keyword: Libraries Measure Mi Nsp Perl Perl Module Poisson Poisson Stirling Measure Programming Stirling Value Values
Users rating: 0/10

License: Freeware Size: 952.32 KB
TEXT::NSP::MEASURES::3D::MI::PS RELATED
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Text::NSP::Measures::2D::MI is a Perl module that provides error checks for Loglieklihood, Total Mutual Information, Pointwise Mutual Information and Poisson-Stirling Measure. SYNOPSIS Basic Usage use Text::NSP::Measures::2D::MI::ll; my...
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Text::NSP::Measures::2D::MI::ps is a Perl module that implements Poisson-Stirling measure of association for bigrams. SYNOPSIS Basic Usage use Text::NSP::Measures::2D::MI::ps; my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10;...
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