Research Article
Feature Reduction Based on Genetic Algorithm and Hybrid Model for Opinion Mining
Table 3
Classification performance of book domain reviews.
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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. | 57 | 23 | 57.00 | 80 | 38 | 80.00 | 64 | 21 | 64.00 | 74 | 16 | 74.00 | 70 | 17 | 70.00 | | Predicted pos. | 34 | 77 | 84.61 | 11 | 62 | 68.13 | 27 | 79 | 86.81 | 17 | 84 | 92.30 | 21 | 83 | 91.20 | | Avg. accuracy | 70.21% | 74.47% | 74.95% | 82.68% (↑) | 80.18% | | Error rate | 29.84% | 25.65% | 25.13% | 17.27% (↓) | 19.89% |
| | Unigram + bigram | | Predicted neg. | 55 | 24 | 55.00 | 75 | 32 | 75.00 | 65 | 20 | 65.00 | 73 | 14 | 73.00 | 72 | 21 | 79.00 | | Predicted pos. | 36 | 76 | 83.51 | 16 | 68 | 74.72 | 26 | 80 | 87.91 | 18 | 86 | 94.50 | 19 | 79 | 86.81 | | Avg. accuracy | 68.66% | 74.97% | 75.97% | 83.21% (↑) | 79.11% | | Error rate | 31.41% | 25.13% | 24.00% | 16.75% (↓) | 20.94% |
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