For two way tables based on co-citations four different test
statistics are reported, the odds ratio, the Concordance, the Jaccard index
and Hubert's Gamma.
Usage
twTStats(twT)
Arguments
twT
A two way table, as produced by twowayTable.
Value
Concordance
The concordance statistic.
Jaccard
The Jaccard index.
Hubert
Hubert's Gamma
OddsRatio
The odds ratio.
Details
The entries in the presumed 2 by 2 table are labeled n11, n12, n21, n22,
corresponding to the entries in the first row first column, first row
second column etc. The odds ratio is the product of n11 and n22 divided
by the product of n12 and n21.
The Conordance is simply the n11 entry. The Jaccard index is the n11
entry divided by the sum of n11, n12, and n21. Hubert's Gamma is
slightly more complicated.
References
Testing Gene Associations Using Co-citation, by B. Ding and
R. Gentleman. Bioconductor Technical Report, 2004