Text::NSP::Measures::2D::CHI::tscore Text::NSP::Measures::2D::CHI::tscore is a Perl module that implements T-score measure of association for bigrams.
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measure Perl module bigrams association T-score measure T-score

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

Text::NSP::Measures::2D::CHI::tscore is a Perl module that implements T-score measure of association for bigrams. Text::NSP::Measures::2D::CHI::tscore is a Perl module that implements T-score measure of association for bigrams.SYNOPSISBasic 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 nppwhere 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 CoefficientINPUT 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 statisticINPUT PARAMS : noneRETURN VALUES : $name .. Name of the measure. Requirements: · Perl

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