What aspect of text mining was compared | Retrospective simulation | Prospective—case study | Prospective—controlled trial | Prospective—other | Total—what was compared |
---|---|---|---|---|---|
Classifiers/ algorithms | 13 | 0 | 0 | 3 | 16 |
Number of features | 2 | 0 | 0 | 0 | 2 |
Feature extraction/sets (e.g., BoW) | 8 | 0 | 0 | 2 | 10 |
Views (e.g., T&A, MeSH) | 5 | 0 | 0 | 1 | 6 |
Training set size | 2 | 0 | 0 | 0 | 2 |
Kernels | 2 | 0 | 0 | 0 | 2 |
Topic specific versus general training data | 3 | 0 | 0 | 1 | 4 |
Other optimisations | 9 | 0 | 0 | 4 | 13 |
No comparison | 5 | 5 | 4 | 1 | Â |
Total—study design (duplicates removed) | (27) | (5) | (4) | (8) |  |