| morphine → be → opiate | 16 |
| morphine → be → opioid | 15 |
| morphine → be → opiate drug | 5 |
| morphine → be → an opioid drug | 3 |
| morphine → be → opioid drugs | 3 |
| negative | neutral | positive |
| 0.486 | 0.438 | 0.077 |
| Raw frequency | 42 |
| Normalized frequency | 0.795 |
| Modifier score | 0.500 |
| Perplexity | 20.952 |