Feature Reduction Based on Genetic Algorithm and Hybrid Model for Opinion Mining

Table 8

Classification performance of movie domain reviews.

Class/method	NB			LR			SVM			BSVM			BNB
	Actual neg.	Actual pos.	Acc. (%)	Actual neg.	Actual pos.	Acc. (%)	Actual neg.	Actual pos.	Acc. (%)	Actual neg.	Actual pos.	Acc. (%)	Actual neg.	Actual pos.	Acc. (%)
Unigram
Predicted neg.	66	24	66.00	87	11	87.00	86	20	86.00	89	10	89.00	76	15	76.00
Predicted pos.	34	76	76.00	13	89	89.00	14	80	80.00	11	90	90.00	24	85	85.00
Avg. Accuracy	71.00%			88.00%			83.00%			89.50% (↑)			80.50%
Error rate	29.00%			12.00%			17.00%			10.50% (↓)			19.50%
Unigram + bigram
Predicted neg.	65	20	65.00	86	10	86.00	84	20	84.00	89	10	89.00	73	13	73.00
Predicted pos.	35	80	80.00	14	90	90.00	16	80	80.00	11	90	90.00	27	87	87.00
Avg. Accuracy	72.50%			88.00%			82.00%			89.50% (↑)			80.00%
Error rate	27.50%			12.00%			18.00%			10.50% (↓)			20.00%