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Text::NSP::Measures::2D::CHI::tscore 1.03

  Date Added: July 20, 2010  |  Visits: 551

Text::NSP::Measures::2D::CHI::tscore

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Text::NSP::Measures::2D::CHI::tscore is a Perl module that implements T-score measure of association for bigrams. SYNOPSIS Basic Usage use Text::NSP::Measures::2D::CHI::tscore; my $npp = 60; my $n1p = 20; my $np1 = 20; my $n11 = 10; $tscore_value = calculateStatistic( n11=>$n11, n1p=>$n1p, np1=>$np1, npp=>$npp); if( ($errorCode = getErrorCode())) { print STDERR $errorCode." - ".getErrorMessage()."n""; } else { print getStatisticName."value for bigram is ".$tscore_value."n""; } 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. The T-score is defined as a ratio of difference between the observed and the expected mean to the variance of the sample. Note that this is a variant of the standard t-test that was proposed for use in the identification of collocations in large samples of text. Thus, the T-score is defined as follows: m11 = n1p * np1 / npp T-score = (n11 - m11)/sqrt(n11) calculateStatistic() - method to calculate the tscore Coefficient INPUT PARAMS : $count_values .. Reference of an hash containing the count values computed by the count.pl program. RETURN VALUES : $tscore .. tscore value for this bigram. getStatisticName() - Returns the name of this statistic INPUT PARAMS : none RETURN VALUES : $name .. Name of the measure..

Requirements: No special requirements
Platforms: Linux
Keyword: Chi Implements Libraries Measure Npp Nsp Perl Module Programming T-score Tscore
Users rating: 0/10

License: Freeware Size: 952.32 KB
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