Table 1.
Evaluation of the query-strategies: title (T), title and body (TB), and a combination of title, body, place, and date (TBPD) for various difficulty levels. We compare our search-engine (PPR) with the search engine of the German police press portal (ORI), reporting nDCG@5 and precision@1 (P@1).
| Method | Time | All levels | Level 1 | Level 2 | Level 3 | ||||
|---|---|---|---|---|---|---|---|---|---|
| nDCG | P@1 | nDCG | P@1 | nDCG | P@1 | nDCG | P@1 | ||
| T@ORI | 0.7 s | 0.13 | 0.14 | 0.28 | 0.31 | 0.01 | 0.01 | 0.00 | 0.00 |
| TB@ORI | 0.9 s | 0.04 | 0.04 | 0.10 | 0.10 | 0.02 | 0.02 | 0.00 | 0.00 |
| T@PPR | 0.6 s | 0.21 | 0.21 | 0.44 | 0.48 | 0.14 | 0.11 | 0.04 | 0.07 |
| TB@PPR | 9.2 s | 0.75 | 0.76 | 0.81 | 0.86 | 0.78 | 0.79 | 0.47 | 0.47 |
| TBPD@PPR | 9.1 s | 0.92 | 0.88 | 0.93 | 0.90 | 0.94 | 0.98 | 0.59 | 0.60 |