| Typicality: | 0.348 |
| Saliency: | 0.434 |
| to researchers | 15 | transitive-object |
| as putting a price | 10 | manner |
| to anyone | 5 | transitive-object |
| collection → be → invaluable | 32 |
| collection → be → invaluable resource | 15 |
| collection → provide → invaluable resource | 8 |
| collection → be → invaluable and irreplaceable resource | 3 |
| negative | neutral | positive |
| 0.013 | 0.196 | 0.791 |
| Raw frequency | 58 |
| Normalized frequency | 0.434 |
| Modifier score | 0.500 |
| Perplexity | 225.051 |