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# Text::NSP::Measures::2D::Dice::jaccard 1.03

Date Added: November 07, 2010  |  Visits: 805

Text::NSP::Measures::2D::Dice::jaccard is a Perl module that implements the jaccard coefficient. SYNOPSIS Basic Usage use Text::NSP::Measures::2D::Dice::jaccard; my \$npp = 60; my \$n1p = 20; my \$np1 = 20; my \$n11 = 10; \$jaccard_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 ".\$jaccard_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 Jaccard Coefficient is the ratio of number of times the words occur together to the number of times atleast any one of the words occur. It is defined as: n11 --------------- n11 + n12 + n21 The Jaccard coefficient can also be computed by applying a transformation to the dice coefficient: \$jaccard = \$dice/(2-\$dice) We use this computation of jaccard in our implementation. Methods calculateStatistic() - method to calculate the jaccard coefficient value INPUT PARAMS : \$count_values .. Reference of an hash containing the count values computed by the count.pl program. RETURN VALUES : \$jaccard .. Jaccard Coefficient 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: Coefficient,  Jaccard,  Jaccard Coefficient,  Libraries,  Nsp,  Number,  Perl Module,  Programming,  Times,  Value Users rating: 0/10