Table 4.

Binary versus term frequency features using SVMLight and SVM-perf on unigrams and bigrams

		Binary			TF
	Precision	Recall	F-measure	Precision	Recall	F-measure
SVMLight Unigram	0.678	0.302	0.418*	0.694	0.269	0.387
SVMLight Bigram	0.711	0.284	0.406	0.708	0.273	0.394
SVMLight TIAB unigram	0.678	0.302	0.418*	0.700	0.263	0.383
SVMLight TIAB bigram	0.730	0.294	0.420*	0.715	0.268	0.389
SVM-perf Unigram	0.395	0.654	0.492	0.390	0.686	0.497
SVM-perf Bigram	0.414	0.675	0.513	0.442	0.594	0.507
SVM-perf TIAB unigram	0.398	0.659	0.496*	0.401	0.609	0.483
SVM-perf TIAB bigram	0.408	0.685	0.512	0.428	0.611	0.503

For each row, significantly better results (p >0.05) are indicated with *.