Table 4.
Accuracy of query search using different stemming functions and stopword lists in Cystic Fibrosis. Evaluation measures used are MAP (mean average precision), R-prec (R precision), and D r (number of relevant documents retrieved).
| Combinations | Measures | ||
|---|---|---|---|
| MAP | R-prec | D r | |
| Baseline | 0.1545 | 0.2098 | 683 |
| Porter stemmer | 0.1663 | 0.2154 | 747 |
| Krovetz stemmer | 0.1663 | 0.2231 | 740 |
| NLM stopword list | 0.1681 | 0.2242 | 723 |
| SMART stopword list | 0.1695 | 0.2243 | 728 |
| Porter stemmer-NLM stopwords | 0.1790 | 0.2332 | 786 |
| Porter stemmer-SMART stopwords | 0.1808 | 0.2342 | 790 |
| Krovetz stemmer-NLM stopwords | 0.1799 | 0.2333 | 782 |
| Krovetz stemmer-SMART stopwords | 0.1808 | 0.2324 | 786 |
The bold font refers to the best values for the parameters.