| for keeping young children | 6 | purpose |
| very | 4 | degree |
| for about 2 years | 4 | temporal |
| car seat → be → effective | 15 |
| car seat → be → useful | 6 |
| car seat → be → helpful | 4 |
| car seat → be → essential tool | 3 |
| negative | neutral | positive |
| 0.078 | 0.364 | 0.559 |
| Raw frequency | 28 |
| Normalized frequency | 0.446 |
| Modifier score | 0.500 |
| Perplexity | 228.060 |