| by the end of 1963 | 3 | temporal |
| for information collection | 2 | purpose |
| volunteer → be in → the field | 13 |
| volunteer → serve in → the field | 3 |
| negative | neutral | positive |
| 0.108 | 0.572 | 0.320 |
| Raw frequency | 16 |
| Normalized frequency | 0.311 |
| Modifier score | 0.700 |
| Perplexity | 12.742 |