Research Article
Alternate Low-Rank Matrix Approximation in Latent Semantic Analysis
Table 7
Average precision, recall, and total number of documents returned for various relative cosine threshold values for the MED collection.
| Cosine threshold | SVD | TULVD | Recall | Precision | Number of documents returned | Recall | Precision | Number of documents returned |
| 0.1 | 97.4 | 21.3 | 135.7 | 97.9 | 17.2 | 165.8 | 0.2 | 94.1 | 43.1 | 64.1 | 94.5 | 38.0 | 73.4 | 0.3 | 89.7 | 59.4 | 41.1 | 87.1 | 53.4 | 44.7 | 0.4 | 83.3 | 70.4 | 30.2 | 81.9 | 66.3 | 32.4 | 0.5 | 66.3 | 76.8 | 21.7 | 68.4 | 75.1 | 23.2 | 0.6 | 51.7 | 86.8 | 15.1 | 51.8 | 84.2 | 15.2 | 0.7 | 30.0 | 91.7 | 18.4 | 33.0 | 90.2 | 9.3 | 0.8 | 18.6 | 97.1 | 4.5 | 20.9 | 90.7 | 5.5 | 0.9 | 7.9 | 100.0 | 1.5 | 6.1 | 100 | 1.3 |
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