Research Article
Feature Reduction Based on Genetic Algorithm and Hybrid Model for Opinion Mining
Table 4
Classification performance of DVD domain review (unigram).
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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. | 82 | 21 | 82.00 | 86 | 22 | 86.00 | 75 | 21 | 75.00 | 86 | 20 | 86.00 | 88 | 17 | 88.00 | Predicted pos. | 18 | 78 | 78.78 | 14 | 77 | 77.77 | 25 | 78 | 78.78 | 14 | 79 | 79.79 | 12 | 82 | 82.82 | Avg. accuracy | 80.42% | 81.95% | 76.87% | 82.92% | 85.39% (↑) | Error rate | 19.59% | 18.09% | 23.11% | 17.08% | 14.57% (↓) |
| Unigram + bigram | Predicted neg. | 81 | 22 | 81.00 | 91 | 33 | 91.00 | 79 | 23 | 79.00 | 80 | 20 | 80.00 | 86 | 19 | 86.00 | Predicted pos. | 19 | 77 | 77.77 | 09 | 66 | 66.66 | 21 | 76 | 76.76 | 20 | 79 | 79.79 | 14 | 80 | 80.80 | Avg. accuracy | 79.42% | 78.29% | 77.89% | 79.92% | 83.47% (↑) | Error rate | 20.60% | 21.10% | 22.11% | 20.10% | 16.58% (↓) |
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