From: Computing symmetrical strength of N-grams: a two pass filtering approach in automatic classification of text documents
N-Grams
Class \(C_{1}\)
Class \(C_{2}\)
\(NG_{penalty\ shootout}=1\)
\(a=0\)
\(b=4\)
\(NG_{penalty\ shootout}=0\)
\(c=18\)
\(d=9\)