TABLE 2. Accuracy, Error Rate, and Area Under Curve of the Validation Results.

			Classification Algorithm
Metric	Feature Extraction		DT	MNB	BNB	LR	kNN	Perceptron	NN	LSVM	ERF	XGBoost
Accuracy (%)	TF		99.04	98.29	95.09	99.36	96.42	98.93	99.68	99.52	99.52	99.15
	TF-IDF	Unigram	98.93	98.01	93.96	98.18	98.67	99.57	99.63	99.52	99.15	99.25
		Bigram	98.02	97.92	90.55	97.49	97.06	98.72	98.99	98.99	98.56	96.80
		Trigram	93.00	92.57	92.68	92.47	90.92	93.54	93.75	93.91	93.43	91.45
		N-gram (n=2:3)	98.56	98.08	90.97	97.81	96.64	98.99	99.57	99.57	98.72	97.44
		Characters Level	99.20	97.97	91.35	98.08	99.36	99.52	99.63	99.63	99.09	99.41
	Word Embeddings		97.33	55.45	64.80	80.61	89.16	72.12	93.86	65.99	98.72	99.52
Error Rate (%)	TF		0.96	1.71	4.92	0.64	3.58	1.07	0.32	0.48	0.48	0.86
	TF-IDF	Unigram	1.07	1.99	6.04	1.82	1.34	0.43	0.37	0.48	0.86	0.75
		Bigram	1.98	2.08	9.46	2.51	2.94	1.28	1.02	1.02	1.44	3.21
		Trigram	7.00	7.43	7.32	7.53	9.08	6.46	6.25	6.09	6.57	8.55
		N-gram (n=2:3)	1.44	1.92	9.03	2.19	3.37	1.02	0.43	0.43	1.28	2.56
		Characters Level	0.80	2.03	8.65	1.92	0.64	0.48	0.37	0.37	0.91	0.59
	Word Embeddings		2.67	44.55	35.20	19.39	10.84	27.89	6.14	34.01	1.28	0.48
Area Under the Curve (%)	TF		97.91	96.87	90.58	98.74	93.45	98.83	99.41	99.03	99.03	98.33
	TF-IDF	Unigram	97.83	97.36	88.75	97.75	98.65	99.16	99.28	99.12	98.14	98.58
		Bigram	97.09	97.62	84.60	98.13	97.75	98.00	99.07	99.07	98.06	96.75
		Trigram	92.86	94.16	92.29	94.98	88.41	95.06	95.06	95.70	94.34	93.26
		N-gram (n=2:3)	97.15	97.67	84.66	98.43	96.91	97.96	99.34	99.34	97.68	97.24
		Characters Level	98.19	97.23	85.12	97.30	99.20	99.03	99.47	99.28	98.20	98.78
	Word Embeddings		94.68	63.05	65.02	70.54	82.48	60.20	89.46	57.59	97.85	99.21