Table 3. Top 40 results with respect to decreasing F-measure (F-m).

Classifier	Feature	Weight	Prec	Recall	F-m	TP	FN	FP	TN
SPegasos	stem	binary	0.9922	0.981	0.9866	3052	59	24	1865
SPegasos	concept + stem	binary	0.9912	0.9817	0.9864	3054	57	27	1862
SPegasos	stem	logF	0.99	0.9817	0.9858	3054	57	31	1858
SPegasos	concept + stem	logF	0.9922	0.9791	0.9856	3046	65	24	1865
SPegasos	stem	freq	0.989	0.9807	0.9848	3051	60	34	1855
SPegasos	concept + stem	freq	0.9889	0.9775	0.9832	3041	70	34	1855
SPegasos	concept + stemBigram	logF	0.9915	0.9736	0.9825	3029	82	26	1863
SPegasos	concFullMorph + stemBigram	freq	0.9892	0.9759	0.9825	3036	75	33	1856
SPegasos	concept + stemBigram	binary	0.9925	0.9724	0.9823	3025	86	23	1866
SPegasos	concFullMorph + stemBigram	expF	0.9876	0.9765	0.9821	3038	73	38	1851
SPegasos	concFullMorph + stemBigram	logF	0.9889	0.9752	0.982	3034	77	34	1855
SPegasos	concept + stemBigram	freq	0.9896	0.9743	0.9819	3031	80	32	1857
SPegasos	concept + stemBigram	expF	0.9886	0.9749	0.9817	3033	78	35	1854
SPegasos	concFullMorph + stemBigram	binary	0.9895	0.9724	0.9809	3025	86	32	1857
SPegasos	stemBigram	freq	0.9882	0.972	0.9801	3024	87	36	1853
SPegasos	stemBigram	binary	0.9895	0.9701	0.9797	3018	93	32	1857
SPegasos	stemBigram	logF	0.9892	0.9704	0.9797	3019	92	33	1856
SPegasos	stemBigram	expF	0.9879	0.9717	0.9797	3023	88	37	1852
C4.5	concept + stem	binary	0.9814	0.9682	0.9748	3012	99	57	1832
SPegasos	stem	expF	0.9827	0.9666	0.9746	3007	104	53	1836
C4.5	stem	binary	0.9849	0.964	0.9743	2999	112	46	1843
SPegasos	concept + stem	expF	0.9792	0.9682	0.9737	3012	99	64	1825
C4.5	stem	logF	0.9808	0.9666	0.9736	3007	104	59	1830
C4.5	stem	expF	0.9808	0.9666	0.9736	3007	104	59	1830
C4.5	stem	freq	0.9808	0.9666	0.9736	3007	104	59	1830
C4.5	concept + stem	logF	0.9798	0.965	0.9723	3002	109	62	1827
C4.5	concept + stem	expF	0.9798	0.965	0.9723	3002	109	62	1827
C4.5	concept + stem	freq	0.9798	0.965	0.9723	3002	109	62	1827
C4.5	concept + stemBigram	logF	0.9647	0.9569	0.9608	2977	134	109	1780
C4.5	concept + stemBigram	expF	0.9647	0.9569	0.9608	2977	134	109	1780
C4.5	concept + stemBigram	freq	0.9647	0.9569	0.9608	2977	134	109	1780
C4.5	concept + stemBigram	binary	0.9662	0.955	0.9606	2971	140	104	1785
Naive Bayes	concept + stem	logF	0.9569	0.9572	0.9571	2978	133	134	1755
Naive Bayes	stem	logF	0.9599	0.9544	0.9571	2969	142	124	1765
C4.5	stemBigram	binary	0.9577	0.9531	0.9554	2965	146	131	1758
C4.5	stemBigram	logF	0.9577	0.9527	0.9552	2964	147	131	1758
C4.5	stemBigram	expF	0.9577	0.9527	0.9552	2964	147	131	1758
C4.5	stemBigram	freq	0.9577	0.9527	0.9552	2964	147	131	1758
C4.5	concFullMorph + stemBigram	binary	0.9556	0.9544	0.955	2969	142	138	1751