| Typicality: | 0.433 |
| Saliency: | 0.428 |
| in the united states | 6 | location |
| in 1998 | 5 | temporal |
| in less than two years | 2 | temporal |
| viagra → be approved by → the fda | 8 |
| viagra → be → approved | 4 |
| viagra → be approved for → sale | 3 |
| negative | neutral | positive |
| 0.144 | 0.623 | 0.233 |
| Raw frequency | 15 |
| Normalized frequency | 0.428 |
| Modifier score | 0.500 |
| Perplexity | 39.673 |